含嘌呤、嘧啶类有机碱基的丁内酯的合成

利用天然手性助剂(-)-冰片所制得的手性源5-[(1s)-(-)-冰片氧基-2(5H)-呋喃酮差向异构体3a+3b与具有生理活性的嘌呤、嘧啶类有机碱基进行不对称Michael加成反应,得到了嘌呤、嘧啶类丁内酯非对映体混合物5a～5e及-5'a～5'e。报道了它们的合成方法以及IR、UV、^1HNMR、^1^3CNMR、MS、元素分析等结构分析数据。其中5d+5'd通过优势结晶拆分法得到单一的光学活性化合物。     

新型手性<i>β</i>-烷氨基-<i>γ</i>-(<i>l</i>-孟氧基)丁内酯的合成

脂肪族伯胺作为亲核试剂与手性合成子5(R)-(l-孟氧基)-2(5H)-呋喃酮(4)发生不对称Michael加成反应, 得到一系列新的手性β-烷氨基-γ-(l-孟氧基)丁内酯类化合物6(产率34～81%, de≥98%). 通过IR, ¹H NMR, ¹³C NMR, MS, 元素分析及单晶X射线衍射分析, 确认了它们的化学结构、立体化学和绝对构型. 此结果为某些具有生物活性化合物及复杂分子的合成提供了新的途径.     

Highly enantioselective synthesis and potential biological activity of chiral novel nucleoside analogues containing adenine and naturally phenol derivatives

This paper described an efficient synthetic strategy for chiral acyclic nucleoside analogues containing both the phenoxy components of some bioactive natural compounds and a heterocyclic base. The phenoxy components with adenine moiety were incorporated into the chiral acyclic nucleoside analogues through two key synthetic tactics. Chiron 5-(R)-menthyloxy-2(5H)-furanone 5 was obtained in good yield from the cheap starting material furfural via a valuable synthetic route. The asymmetric Michael addition of 5 with adenine and the subsequent reduction reaction afforded the key chiral intermediate, 2-(R)-(9′-adeninyl)-1,4-butanediol 8. The absolute configuration of 8 was established by X-ray crystallography. The intermolecular dehydration reaction between 2-(9′-adeninyl)-1,4-butanediol 8 and phenoxy components 9 on treatment with diethyl azodicarboxylate and triphenylphosphine was carried out to give the chiral acyclic nucleoside analogues 1a-1e. The regioselectivity of the reaction was established by NMR methods, especially through ¹³C NMR shifts and NOE effect observed in the target molecule 1c, as well as by HMBC/HMQC experiments. The target compounds were tested for inhibition of cytopathogenicity against different cancer cells and exhibited potential anticancer activity.     

Synthesis of spiro-cyclopropane derivatives containing multiple chiral centers

Tandem asymmetric double Michael addition/internal nucleophilic substitution of the novel chiral source, 5-(l-menthyloxy)-3-bromo-2(5H)-furanone with nucleophilic alcohol compounds has been investigated. The tandem asymmetric reaction can afford four new stereogenic centers with one reaction and give optically pure spiro-cyclopropane derivatives 5a--5d which are difficult to obtain by routine methods. The synthetic method for 5a--5d was studied in detail and the new compounds were identified on the basis of their analytical data and spectroscopic data, such as [α]~(20),IR,~1H NMR,~(13)C NMR, MS and elementary analysis. The absolute configuration of the sprio [5-l-menthyloxy-3-bromo butyrolactocyclopropane-3″, 3′(4′-methyloxy-5′-menthyloxybutyrolactone)] (5a) was established by X-ray crystallography. The work can provide important synthetic strategy in synthesis of some new optically active spiro-cyclopropane analogues and some biologically active molecules with complex structure.     

Asymmetric Synthesis of Some Chiral Aryl and Hetero Aryl-Substituted β-, γ-, δ-Hydroxy Esters

Sixteen chiral β-, γ-, and δ-hydroxy esters with aryl, substituted aryl, and heteroaryl groups 2a–2s were synthesized by the asymmetric reduction of their corresponding keto esters 1a–1s as chiral pure reference compounds and starting materials. The asymmetric reduction was achieved by (R)-Me-CBS-oxazaborolidine. Ten new chiral γ- and δ-hydroxy esters 2d, 2e, and 2j–2s were obtained with high ee values and characterized by infrared, NMR (¹H and ¹³C), mass spectrometry, chiral high-performance liquid chromatography, and specific rotation.     

An Efficient Synthesis of Highly Optically Active 4-Substituted-2（5H）-furanones from Chiral 3-Bromo-2（5H）-furanone

Highly optically active 4-substituted-2(5H)-furanones 6a-6j were obtained in good yields with de≥98% by the tandem Michael addition/elimination reaction of chiral 3-bromo-2(SH)-furanone (4a), which was conveniently prepared starting from 2-furaldehyde under mild conditions. The products were identified on the basis of their satisfactory elemental analysis and spectroscopic data of IR, UV, ^1H NMR, ^13C NMR and mass spectra. The stereochemistry and absolute configuration of this type of compounds were established by the X-ray crystallographic study. The reaction provided a short and efficient synthesis of the interesting highly optically active 4-subsdtuted-2(5H)-furanones containing an active pyrimidine and a purine base group.     

多功能光学活性丁二醇衍生物的合成和结构

通过新的合成策略,以手性合成子3和具有生物活性的有机碱类化合物4为反应底物,利用Michael不对称加成反应,合成得到光学纯的5-(R)-［(1R,2S,5R)-(-)-氧基］-4-(R)-(杂环碱基)-2(5H)-呋喃酮(5). 加成物5通过还原反应得到了多功能光学活性的二醇类化合物6,产率为42%~82%,e.e.≥98%. 化合物6的化学结构得到了确认,其立体化学结构和绝对构型经X射线晶体学测定得到了确定.     

N-多氟烷基取代和葡萄糖基取代的1,2,4-三唑-5-硫酮类席夫碱的合成及其杀虫活性

为改善三唑类化合物的生物活性, 以3-苯基-4-氨基-1,2,4-三唑-5-硫酮为原料, 将其与芳香醛在冰醋酸体系中反应, 得到3-苯基-4-芳基亚甲氨基-1,2,4-三唑-5-硫酮类席夫碱(4a～4i). 在此基础上, 化合物4a～4i分别与多氟烷基碘代烷和溴代乙酰基葡萄糖反应合成了一系列1,2,4-三唑-5-硫酮类席夫碱的多氟烷基取代物5a～5r和葡萄糖基取代物6a～6d, 并用¹H NMR, ¹⁹F NMR, IR和MS谱以及元素分析表征了它们的结构. 初步生物活性测试结果表明, 部分目标化合物具有明显的杀虫活性.     

某些官能化手性氮杂环丙烷衍生物的合成及其结构

手性元5-(R)-(1R,2S,5R)-孟氧基-3-溴-2(5H)-呋喃酮(3)与氮亲核试剂伯胺(4), 通过串联的不对称Michael加成/分子内亲核取代反应得到了具有两个新的手性中心的1R,5S-6-烷基-6-氮杂-2R-孟氧基-3-氧杂-4-氧代二环[3,1,0]己烷(5a～5d), 产率41%～51%, e.e.≥98%. 后者经LiAlH₄还原得到N-烷基-2,3-双(羟甲基)氮杂环丙烷(6a～6d), 产率66%～91%. 化合物5和6通过元素分析, IR, ¹H NMR, ¹³C NMR, MS以及X射线晶体分析, 测定了它们的化学结构及立体化学构型. 本文为N-烷基氮杂环丙烷类化合物的合成提供了一种有效途径.     

2-甲硫基-7(5)-取代-3-吡唑并[1,5-a]嘧啶甲酸乙酯的区域选择性合成与2D NMR 研究

利用3-甲硫基-4-乙氧羰基-5-氨基-1H-吡唑分别与甲基/芳基烯胺酮反应, 合成了8种新的化合物2-甲硫基-7-取代-3-吡唑并[1,5-a]嘧啶甲酸乙酯(3a～3g)和2-甲硫基-5-甲基-3-吡唑并[1,5-a]嘧啶甲酸乙酯(4a). 化合物的结构均经元素分析, IR, ¹H NMR, MS所证实, 异构体3a和4a的结构进一步由¹³C NMR, HMQC和HMBC确认. 同时, 探讨了区域选择性合成吡唑并[1,5-a]嘧啶类化合物可能的反应机理, 并对部分化合物杀菌活性进行了测试.     

Asymmetric synthesis,stereochemistry, and absolute configuration of 1,2-5-trimethyl-5-(2-cyanoethyl)- and 1,2,5-trimethyl-4-piperidinones

The asymmetric Michael alkylation of (–)-1,2,5-trimethyl-4-(1S-phenylethylimino)piperidine by electrondeficient alkenes proceeds with the formation of(+)-cis-(2S,5S)- and (–)-trans-(2R,5S) diastereomers of 1,2,5-trimethyl-5-(2-cyanoethyl)- and 1,2,5-trimethyl-5-(2-methoxycarbonylethyl)-4-piperidinones containing a chiral quaternary center C(₅). The spatial structure of these new chiral 4-piperidinones has been established on the basis of ¹H and ¹³C NMR spectroscopic data. The absolute configuration of the C(₂) and c(₅) chiral centers in the diastereomers has been determined by stereochemical correlation on the basis of circular dichroism data.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1369–1378, October, 1992.     

基于5-孟氧基-3-溴-2(5H)-呋喃酮的环丙烷合成方法研究:碳亲核试剂启动的不对称串联反应

研究碳亲核试剂(2a～2e)与手性合成砌块, 5-孟氧基-3-溴-2(5H)-呋喃酮的不对称串联反应, 分别得到不同结构的光学活性化合物3a～3d, 4, 5和6. 通过X射线晶体分析确认了它们的立体化学结构.     

异噁唑基取代的1,2,4-噁二唑啉和吡唑啉类化合物的合成

通过3-乙酰基-5-羟甲基异噁唑衍生的Schiff碱2与由醛肟原位生成的腈氧化物的1,3-偶极环加成反应, “一锅法”制备了5-甲基-5-[5-(叔丁基二甲基硅氧基甲基)-3-异噁唑基]-3-芳基-4-(4-甲氧基苯基)-4,5二氢-1,2,4-噁二唑类化合物4a～4e; 同时由3-乙酰基-5-羟甲基异噁唑衍生的α,β-不饱和酮(5)与取代苯肼的环化反应制备了5-(叔丁基二甲基硅氧基甲基)-3-[(1,5-二芳基)-3-(4,5-二氢吡唑基)]-异噁唑类化合物6a～6i. 所有新化合物的结构经核磁共振谱氢谱和碳谱、质谱、红外光谱以及高分辨质谱等进行了确证.     

Synthesis of enantiomerically pure spiro-cyclopropane derivatives containing multichiral centers

A novel chiral source, 5-(R)-[(1R,2S,5R)-(−)-menthyloxy]-3-bromo-2(5H)-furanone (5a), was obtained in 46% yield with d.e.≥98% from the epimeric mixture of 5-(l-menthyloxy)-3-bromo-2(5H)-furanone (5a+5b) obtained via the bromination of an epimeric mixture of 5-(l-menthyloxy)-2(5H)-furanone (3a+3b) followed by the elimination of hydrogen bromide. The asymmetric reaction of 5a with a nucleophilic alcohol afforded enantiomerically pure spiro-cyclopropane derivatives containing four stereogenic centers, 9a–9e, in 50–68% yield with d.e.≥98%. The enantiomerically pure compounds 9a–9e were identified on the basis of their analytical data and spectroscopic data, such as [α]_D²⁰, UV, IR, ¹H NMR, ¹³C NMR, MS and elementary analysis. The absolute configuration of the chiral spiro-cyclopropane compound 9a was established by X-ray crystallography.     

手性4-取代丁内酯类化合物的合成及其结构研究

脂肪族伯胺和伯醇作为亲核试剂5与5-L-孟氧基丁烯内醋（4）手性合成子通过 不对称Michael加成，得到代-丁内酯类化合物6（44％-57％，ee≥98％）．通过元 素分析，[α]_D~(20)，IR，1~H NMR，了它们的化学结构、立体构型、绝对构型． 可以为某些具有生物活性的化合物及复杂分子的合成提供新的途径．     

Synthesis of 2(5H)‐Furanone Derivatives with Bis‐1,2,3‐triazole Structure

A series of new chiral 2(5H)‐furanone derivatives containing bis‐1,2,3‐triazole moiety were designed and synthesized from (5S)‐5‐alkoxy‐3,4‐dihalo‐2(5H)‐furanones 1 , dicarboxyl amino acids 2 , propargyl bromide, and organic azides 5 under mild conditions via the sequential three steps, including asymmetric Michael addition‐elimination, substitution and no‐ligand click reaction. Twelve new intermediates, including N‐[5‐alkoxy‐2(5H)‐furanonyl] dicarboxyl amino acids 3 and their corresponding propargyl esters 4 , and twelve target molecules 6 were characterized by FTIR, ¹H NMR, ¹³C NMR, MS and elemental analysis. The influences of different synthetic conditions and substrates in each step were investigated. The research provides a new method and idea for the synthesis of 2(5H)‐furanone compounds with polyheterocyclic structure due to the diversities of four basic unit molecules.     

Synthesis and Characterization of Novel Chiral (1R,2R)-1,2-Bis[5-(Aminomethylphospinic Acid)-1,3,4-Thiadiazol-2-YL]Ethane-1,2-Diols

Abstract

(1R,2R)-1,2-bis[5-(arylideneamino)-1,3,4-thiadiazol-2-yl]ethane-1,2-diol (2a–d) were synthesized by using appropriate aldehydes and (1R,2R)-1,2-bis(5-amino-1,3,4-thiadiazol-2-yl)ethane-1,2-diol (1) as a starting compound. Then, the phosphinic acid component (3a–d) were obtained from (2a–d) and hypophosporus acid. In addition, the structures of the novel chiral compounds (2a–d) and (3a–d) were confirmed by elemental analyses, IR, ¹H-NMR, ¹³C-NMR, and ³¹P-NMR spectra.

¹H NMR and ¹³C NMR spectra for 1, 2a, and 3a (Figures S1–S6) are available online in the Supplemental Materials.     

3-(3-叔丁氧基)丁二酰亚胺基单环β-内酰胺衍生物的合成

从苹果酸出发, 经过一系列反应得到3-(3-叔丁氧基)丁二酰亚胺乙酰氯. 3-(3-叔丁氧基)丁二酰亚胺乙酰氯和含不同取代基的Schiff碱1a～1h反应得到8个新的3-(3-叔丁氧基)丁二酰亚胺基单环β-内酰胺衍生物2a～2h, 化合物2a～2h的结构经IR, ¹H NMR, MS和元素分析所确证.     

Synthesis of novel pyrimidine derivatives with (pyridin-3-ylmethyl)thio and phenylamino moieties and evaluation of their antifungal activity

A series of novel pyrimidine derivatives with (pyridin-3-ylmethyl)thio and phenylamino moieties were synthesized from ethyl acetoacetate, thiourea, 3-pyridinylmethyl chloride hydrochloride, and substituted anilines by multi-step reactions. The structures of the target compounds were characterized by IR, ¹H NMR, ¹³C NMR and elemental analysis. The in vitro antifungal activities against Botrytis cinerea and Sclerotinia sclerotiorum were evaluated. The result showed that N-phenyl-6-methyl-2- ((pyridin-3-ylmethyl)thio) pyrimidin-4-amine (4a) displayed high inhibition activity against Botrytis cinerea with 87.5%inhibition at 100 µg/mL; 4a, and N-(4-isopropylphenyl)-6-methyl-2-((pyridin-3-ylmethyl)thio)pyrimidin-4-amine (4c), N-(4-methoxyphenyl)-6-methyl-2-((pyridin-3-ylmethyl)thio)pyrimidin-4-amine (4d) and N-(2-hydroxy-5-chloro)-6-methyl-2-((pyridin-3-ylmethyl)thio)pyrimidin- 4-amine (4h) exhibited sufficient activities against Sclerotinia sclerotiorum with 86.6% –93.7% inhibitions at the same concentration.     

手性胍盐离子液体的合成

以1,3-二甲基-2-咪唑啉酮, α-甲基苄胺为原料, 三步合成了手性胍的氯盐, 再经复分解反应, 共合成了14种手性胍离子液体并对其结构性质进行了表征. 该类离子液体有望用于催化不对称Henry 反应、Michael加成反应等.