(2R)-莰烷磺内酰法合成红褐林蚁和多点林蚁哟虫信息 素的主要组分3-乙基－4 －甲基戊酸甲酯

以(2R)-莰烷磺内酰胺为手性助剂,经不对称Michale加成、断裂等简单步骤合成红褐林蚁和多点林蚊尾虫信息(3R)和(3S)-3-乙基－4－甲基戊酸甲酯(1),该合成的对映异构体纯度均达94％e.e.以上,另外其关于中间体(3'R)－N'－3'-乙基-4-甲基戊酰基莰烷-10,2-磺内酰胺的单晶结构进行了报道,并讨论了在有或无CuBr·Me~2时Michael加成反应的机理。     

(2R)酰法合成红褐林蚁和多点林蚊昆虫信息素的主要组分3-乙基-4-甲基戊酸甲酯

以(2R)-莰烷磺内酰胺为手性助剂,经不对称Michael加成、断裂等简单步骤合成了红褐林蚁和多点林蚊昆虫信息素(3R)和(3S)-3-乙基-4-甲基戊酸甲酯(1),该合成的对映异构体纯度均达94%e.e.以上.另外其关于中间体(3'R)-N-3'-乙基-4-甲基戊酰基莰烷-10,2-磺内酰胺的单晶结构进行了报道,并讨论了在有或无CuBr@Me2S时Michael加成反应的机理.     

(-)-莰烷磺内酰胺法合成(S)和(R)切叶蚁警界信息素

本文以樟脑衍生物(-)-莰烷磺内酰胺(2)为原料，经N-烷酰基莰烷-2,10-磺内酰胺(3)与碘代烷的不对称烷基化反应，用二锂代乙基苯基砜取代磺内酰胺助剂以及铝汞还原性脱硫反应等三步合成(S)和(R)-切叶蚁警界信息素(1)，其光学纯度高达95%e.e.以上。     

（—）—莰烷磺内酰胺法合成（S）和（R）切叶蚁警戒信息素

本文以樟脑衍生物(-)-莰烷磺内酰胺(2)为原料,经N-烷酰基莰烷-2,10-磺内酚胺(3)与碘代烷的不对称烷基化反应,用二锂代乙基苯基砜取代磺内酰胺助剂以及铝汞还原性脱硫反应等三步合成(S)和(R)一切叶蚁警戒信息素(1),其光学纯度高达95％e.e以上。     

(S)的(R)吉尼斯蚁警戒素合成方法研究

以樟脑衍生物(-)-莰烷磺内酰胺为原料,经N-酰基莰烷-2,10-磺内酰胺与EtMgBr进行Michael加成反应,用氢化铝锂取代磺内酰胺助剂及溴化锂取代等步骤合成了(S)和(R)吉尼斯蚁警戒素,光学纯度达98%ee。     

(-)-莰烷磺内酰胺法立体选择性合成米象虫和玉米象虫聚集合信息素

本文以(-)-莰烷-2, 10-磺内酰胺(2)为原料经六步反应立体选择性地合成了米象虫和玉米象虫聚集信息素(4S, 5R)-Sitophilure, 两个手性中心是由N-丙酰基-莰烷-2, 10-磺内酰胺(3)与丙醛进行的不对称顺式醛醇缩合反应一次性引入的。该全合成的对映异构体纯度可达96%e.e。     

(一)-莰烷磺内酰胺法立体选择性合成米象虫和玉米象虫聚集合信息素

本文以(-)-莰垸-2,10-磺内酰胺(2)为原料经六步反应立体选择性地合成了米象虫和玉米象虫聚集信息素(4S,5R)-Sitophilure,两个手性中心是由N-丙酰基-莰烷-2,10-磺内酰胺(3)与丙醛进行的不对称顺式醛醇缩合反应一次性引入的。该全合成的对映异构体纯度可达96％e.e。     

(R)-和(S)-石蚕蛾属于信息素的合成

以樟脑衍生物(-)-莰烷磺内酰胺为原料,经N-(E-2-烷烯酰基)莰烷-10,2-磺内酰胺与烷基格氏试剂的不对称Michael加成反应,LiAlH4还原断裂,3-甲基已醇的碘代反应及有机镉试剂与丙酰氯的偶联反应制得(R)-和(S)-石蚕蛾雄性性信息素6-甲基于-3-壬酮,其光学纯度达96%ee以上。     

桃潜蛾性信息素的合成研究

(-)-莰烷磺内酰胺手性助剂与巴豆酸酰氯作用生成N-反式丁烯酰基衍生物(4),进而与n-C~4H~9MgBr进行Michael加成反应,发现在CuBr.Me~2S存在下,产物以S构型为主,且化学产率明显提高。经六步合成了桃潜蛾性信息素(S)-14-甲基-1-十八碳烯(1)及其对映异构体(R)-1。     

(R)-(+)-和(S)-(—)磷酸苯并哌林对映体的合成新方法

报道了(R)-和(S)-磷酸苯丙哌林对映体的合成新方法.以邻苄基苯酚和(S(+)-环氧氯丙烷为原料,通过成醚、选择性还原开环两步反应简捷高效地制得重要中间体(R)-1-(2-苄基苯氧基)-2-丙醇(2).中间体2与对甲苯磺酰氯酰化,制得中间体(R)-1-(2-苄基苯氧基)-2-丙醇对甲苯磺酸酯(3),该中间体与哌啶发生一次SN2反应直接得到(S)-(—)-苯丙哌林,该中间体与溴化锂和哌啶发生两次SN2反应制得(R)-(+)-苯丙哌林.然后它们分别与磷酸成盐制得相应的(S)-(—)-和(R)-(+)-磷酸苯丙哌林,其结构通过1H NMR和HRMS进行了表征.该合成方法路线短,反应条件温和,易于操作,且收率好,适合工业化生产.     

掌性5-(1-孟氧基)-3,4-二溴-2-(5H)-呋喃酮的光学片合成及新的串联不对称Michael加成消除反应

手性γ-孟氧基丁烯酸交酯在构成各种杂环化合牧天然产物中起重要作用.本文报道了一些新的γ-孟氧基丁烯交酯的新的手性源的制备和研究了它们的不对称反应.     

Synthesis of N-methyl-N-[(1S)-1-[(3R)-pyrrolidin-3-yl]ethyl]amine

N-Methyl-N-[(1S)-1-[(3R)-pyrrolidin-3-yl]ethyl]amine (1)(1) is a key intermediate in the preparation of premafloxacin (2), which was under development as an antibiotic for use against pathogens of veterinary importance. This paper describes the development of a practical, efficient, and stereoselective process for the preparation of 1 from isobutyl (3S)-3-[methyl[(1S)-1-phenylethyl]amino]butanoate (5c). The key steps in the synthetic sequence are an asymmetric Michael addition, which yields 5c, and a stereoselective alkylation, which yields (3S,4S)-3-allyl-1,4-dimethylazetidin-2-one (17).     

光学活性3-(1'-羟基乙基)-4- 乙酰氧基-β-内酰胺的立体选择 性合成

(1'R,3R,4R)-N-取代-3-(1'-羟基乙基)-4-乙酰氧基-β-内酰胺(3)是合成青霉烯和碳青霉烯类β-内酰胺抗生素的关键中间体。以廉价的L-抗坏血酸为原料,制得S-缩异丙氧叉甘油醛(5),与胺反应定量转变成相应的手性亚胺(6a～6d),6与双烯酮[2+2]环加成反应,高立体选择性地合成3(S)-乙酰基-β-内酰胺(8a～8d),其非对映体过量由类似反庆的80%提高到接近100%。8a经四步反应得到目标化合物3a。     

Progress toward the total synthesis of callipeltin A (I): asymmetric synthesis of (3S,4R)-3,4-dimethylglutamine

[reaction:see text] During the total synthesis of the novel cyclic depsipeptide callipeltin A (1), the unit (3S,4R)-3,4-dimethylglutamine, was successfully synthesized by asymmetric Michael addition and subsequent electrophilic azidation. The key feature of this approach is the generation of three adjacent stereogenic centers using the same camphorsultam chiral auxiliary.     

Organocatalytic asymmetric total synthesis of (R)-rolipram and formal synthesis of (3S,4R)-paroxetine

An efficient enantioselective total synthesis of (R)-rolipram and an efficient enantioselective formal synthesis of (3S,4R)-paroxetine has been achieved using the highly enantioselective Michael addition of malonate nucleophiles as key steps in both cases.     

1-氯-3-硝基-2-丁烯与2-硝基丙烷钠盐的SRN1反应

本文研究了1-氯-3-硝基-2-丁烯与2-硝基丙烷钠盐的SRN1反应, 结果表明这种开链状纯脂肪族烯丙基型化合物发生了不重排的SRN1反应.     

Enantioselective Michael reactions of chiral secondary enaminoesters with 2-substituted nitroethylenes. Syntheses of trans, trans-2,4-disubstituted pyrrolidine-3-carboxylates

The Michael reaction of chiral 3-substituted secondary enaminoesters with 2-substituted nitroethylenes leads to (Z)-adducts, with good to excellent diastereoselectivity. The nitro group of these adducts was catalytically reduced to give, after cyclization and chiral amine elimination, pyrrolines or pyrrolidines after further reduction. In particular, the syntheses of ethyl (2R,3S,4S)-2,4-dimethylpyrrolidine-3-carboxylate and ethyl (2R,3R,4S)-2-(4-methoxyphenyl)-4-(3,4-(methylenedioxy)phenyl)pyrrolidine-3-carboxylate are described.     

Synthesis of （2R,4R）—2—N—tert—Butyloxycarbonyl Amino—4,5—epoxido—valeric Acid Methyl Ester

The stereoselective synthesis of (2R,4R)-2-N-tert-butyloxycarbonyl amino-4,5-epoxido-valeric acid methyl ester 8,which is the key intermediate for the synthesis of (2′S,2R)-3-trans-nitrocyclopropyl-alanine,was first accomplished.     

Synthesis and Analysis of the Sterically Constrained L-Glutamine Analogues (3S,4R)-3,4-Dimethyl-l-glutamine and (3S,4R)-3,4-Dimethyl-l-Pyroglutamic Acid

The nonproteinogenic amino acids (3S,4R)-3,4-Dimethyl-l-pyroglutamic acid and (3S,4R)-3,4-dimethyl-l-glutamine -- found in the cyclic depsipeptides callipeltin B, callipeltin A, and papuamide A -- were synthesized from a common intermediate derived from l-pyroglutamic acid. The diastereoselective introduction of the methyl groups was accomplished by cuprate addition and enolate alkylation, followed by a kinetic epimerization of the C-4 methyl substituent. (3S,4R)-3,4-dimethyl-l-glutamine shows a conformational restriction of its side chain which may be related to its biological function in the natural products where it is found.