新型手性基醇的合成及其用于不对称催化醛类烷基化反应

制备了一种由糖类化合物衍生物新型手性氨基醇（Ｉ），并将其作为手性源用于醛类的不对称烷基化反应，考察了在手性氨基酸的存在下，各种醛和二乙基锌作用生成相应的手性仲醇的光学收率及化学收率，结果表明，该催化剂地于芳香醛的烷基化更为有效，并考察了几种反应条件对于苯甲醛的不对称催化烷基化反应的影响，其中最佳结果为１－苯基－１－两醇的光学收率达８２．７％，而化学收率达５８．８％。     

新型手性β—氨基醇用于不对称催化醛类烷基化反应

将自己研制的一种新型β－氨基醇作为手性源用于醛类的不对称催化烷基化反应。考察了在这种手性β－氨基醇存在时各种醛和二乙基锌作用生成相应的手性仲醇的光学收率，考察了几种反应条件参数对于苯甲醛的这种不对称催化反应的影响，其中最佳结果为１－苯基丙醇的光学收率达７４．１％，而其化学产率达９３．８％。     

新型手性β－氨基醇用于不对称催化醛类烷基化反应

将自己研制的一种新型β－氨基醇（Ⅰ）作为手性源用于醛类的不对称催化烷基化反应。考察了在这种手性β－氨基醇（催化量）存在时各种醛和二乙基锌作用生成相应的手性仲醇的光学收率。考察了几种反应条件参数对于苯甲醛的这种不对称催化反应的影响，其中最佳结果为１－苯基丙醇的光学收率达７４．１％，而其化学产率达９３．８％。     

光学活性有机钛试剂与苯甲醛不对称加成反应

光学活性二醇（１Ｒ，２Ｒ）－（＋）－１，２－二苯基－１，２－乙二醇（Ⅲａ）和（２Ｒ，３Ｒ）－（－）－１，１，４，４－四苯基－２，３－（缩丙酮）－１，４－丁二醇（Ⅲｂ）分别修饰Ｔｉ（ＯＰｒｉ）３Ｃｌ，再与甲基锂和乙基锂进行烷基化，制备出新的手性有机钛试剂Ⅱａ和Ⅱｂ，然后与苯甲醛进行加成，所得１－苯基乙醇（Ⅳａ）和１－苯基丙醇（Ⅳｂ）的光学收率分别为２５～６５％ｅ．ｅ．和１０～２０％ｅ．ｅ．。简单讨论了Ｃ２－对称型二醇对立体选择性及反应条件的影响     

手性方酰胺基醇钛合物诱导的芳醛的不对称呐醇偶联反应

合成了两个手性方酰胺基醇, 与TiC1₄(THF)₂-Zn形成了手性配合物, 并用来催化芳醛的不对称呐醇偶联反应, 反应取得很高的化学产率和较高的光学收率, 同时考察了芳醛结构和共还原剂对反应的化学产率和光学收率影响.     

手性氨基醇催化的前手性芳酮的不对称还原反应

首次以天然D-樟脑的衍生物为原料, 合成了两个新型龙脑基氨基醇配体, 研究了它们与硼烷原位制备成手性噁唑硼烷后, 在不对称催化氢化还原前手性芳酮中的性能, 得到的手性仲醇的对映体过量(ee)值最高可达96%, 还考察了反应温度、时间、溶剂等因素对苯乙酮的不对称氢化还原的化学产率和光学收率的影响.     

(R)-α-萜品醇的不对称合成

在催化量的手性催化剂存在下，利用１－苯磺酰基－３－丁烯－２－酮与异戊二烯的不对称催化Ｄｉｅｌｓ－Ａｌｄｅｒ反应，合成了（Ｒ）－α－萜品醇５，光学纯度值达到９２％．     

(1R,2S)或(1S,2R)-1,2-二苯基-2-氨基乙醇衍生物手性配体的合成及其用于不对称催化反应

重点报道了以（１Ｒ，２Ｓ）或（１Ｓ，２Ｒ）－１，２－二苯基－２－氨基乙醇衍生物手性配体的合成及其用于不对称催化反应的研究，如去氢氨基酸的氢化、醛的乙基锌加成、酮的还原、活泼亚甲基化合物的烷基化、醛的硅腈化和瑞福马斯基反应等．研究了手性配体的结构、底物和反应条件等对上述反应的对映选择性和催化活性的影响．     

钯-手性膦催化降冰片烯的不对称氢酯基化反应

首次用Ｐｄ（ＯＡｃ）２－１，４∶３，６－双脱水－２，５－二（二苯基膦）－Ｌ－艾杜糖醇（ＤＤＰＰＩ）－ｐ－ＴｓＯＨ催化体系对降冰片烯进行了不对称氢酯基化反应，获得了较好的结果．考察了手性膦配体的结构以及磷原子与钯原子的摩尔比对反应的影响，发现在一个磷原子配位一个钯原子时，获得了较高的光学产率．同时考察了反应温度、反应压力及溶剂对降冰片烯不对称氢酯基化反应的影响，发现在１２０℃，５．０ＭＰａ，ｎ（Ｐ）／ｎ（Ｐｄ）＝１时，化学产率可达７１．６％，光学产率可达９２．２％．     

二类手性铜催化剂的合成及其在光学活性菊酸合成中的应用研究

报道了双恶唑啉和Ｓｃｈｉｆｆ碱二类手性配合物的合成及其在光学活性菊酸的不对称合成中的应用，以合成氯霉素中间体的无效体（１Ｓ，２Ｓ）－２－氨基－１－对硝基苯基－１，３－丙二醇为原料，分别制得了二取代双恶唑啉和Ｓｃｈｉｆｆ碱二类配体，并将其分别与醋酸铜配合后得到手性铜催化剂来诱导烯烃（２，５－二甲基－２，４－己二烯和１，１－二苯乙烯）与重氮乙酸酯的不对称环丙烷化反应，最高获得４５．２％ｅ．ｅ。     

手性配体催化二烷基锌—羰基不对称加成制光活性醇的反应

关于手性配体催化二烷基锌一羰基的不对称加成生成光活性醇的反应,从催化剂、不对称催化机理与自催化过程、手性放大等方面进行了概述,参考文献50篇。     

用手性配体改性铝锂试剂对芳香酮的还原

用手性一元酮作辅助配体,与１,２,５,６－二丙酮甘ｉＡｌｈ５对芳香酮进行对映选择 的,得到光学活性产物８个。通过与α－乙酰氧基－Ｌ－丙酰氯生成非对映异构体酯,经气相色谱分析,芳酮挑学产率为２３．３￣７１．２％。初步探讨了配体之间对称性匹配的情况。     

New chiral bis(diphenylphospholane) ligands: design, synthesis, and application to catalytic enantioselective aldol reaction to ketones

New chiral bidentate diphenylphospholanes were designed targeting a catalytic enantioselective aldol reaction to ketones. Ligands 5l and 5m having cis-2-butenyl and cyclopropyl groups at the linker part, respectively, were identified as effective chiral ligands for a CuF-catalyzed enantioselective aldol reaction to ketones. Catalysts prepared from CuF·3PPh₃·2EtOH and these ligands produced ketone aldol products with up to 66% ee, which is promising particularly for this extremely difficult and important catalytic enantioselective carbon-carbon bond forming reaction. The enantioselectivity was strongly dependent on the linker structure. Construction of a deep chiral pocket around the copper metal with stable bidentate chelation is the key to meaningful enantioinduction.     

铑(I)催化的不对称硅氢化反应合成手性2-氨基-1-芳基乙醇研究

报道了以Rh()-手性2-(2-吡啶基)-4-羧甲基-1,3-噻唑烷为催化剂,2-氨基芳香酮的不对称硅氢化反应,在常温常压下手性2-氨基-1-芳基乙醇的产率几乎可达定量,产品光学纯度可达80%e.e以上.     

2-Pyridylsulfinamides as effective catalysts in the asymmetric alkylation of aldehydes with diethylzinc

Chiral 2-pyridylsulfinamides were shown to be effective catalysts in the alkylation of aryl and alkyl aldehydes with diethylzinc providing the corresponding alcohols in excellent enantioselectivity. Sulfinamide catalysts possessing solitary chirality at the sulfur center produced the product phenethyl alcohol in good enantioselectivity. Diastereomeric sulfinamides possessing chirality at the carbon-bearing nitrogen and at the sulfur of the sulfinamide increased the enantioselectivity of the product alcohols up to >99%. However, there is no effect of the match-mismatch pair of sulfinamide diastereomers on the outcome of the chiral induction of the product phenethyl alcohols. It was conclusively proved that chirality at the sulfur center is mandatory for obtaining good enantioselectivity in the reaction.     

Novel Stereoselective Carbonyl Reductase from Kluyveromyces marxianus for Chiral Alcohols Synthesis

A novel nicotinamide adenine dinucleotide phosphate（NADPH）-dependent carbonyl reductase from Kluyverornyces marxianus（KmCR） was identified, which can convert various prochiral ketone esters and ketone substrates to their corresponding chiral alcohols. KmCR was over-expressed in E. coli BL21（DE3）, purified to homogeneity, and characterized. The purified enzyme exhibits the highest activity at 40℃ and pH=6.0. Based on the gel filtration and sodium dodecyl sulfate-polyacrylamide gel eiectrophoresis（SDS-PAGE） analysis, the monomeric protein was determined to have a molecular weight of approximate 39000. Vmax and Km of KmCR are 4.28 μmol.min^-1·mg^-1 and 0.41 mmol/L for ketone ester substrate ethyl 2-oxo-4-phenylbutyrate（OPBE）, 3.09μmol.min^-1·mg^-1 and 1.21 mmol/L for cofactor NADPH, respectively. Cofactor recycle was achieved by co-expression of KmCR and glucose dehydrogenase（GDH） in E. coli. Recombinant E. coli harboring KmCR and GDH showed moderate asymmetric reduction activity towards various α- and β-ketoesters, diaryl ketone substrates. In an aqueous/butyl acetate biphasic system, the whole-cell biocatalyst was used to prepare ethyl （R）-2-hydroxy-4- phenylbutanoate[（R）-HPBE] in an e.e. of 99.5% with a space-time yield of 433.6 g.L-1.d-1 and a yield of 80.3% at 270 g/L OPBE.     

Axially chiral tridentate isoquinoline derived ligands for diethylzinc addition to aldehydes

The synthesis and resolution of new tridentate isoquinoline-derived ligands has been developed. The key steps in the synthetic sequence include successive, chemo-selective Suzuki-Miyaura cross-couplings of 1,3-dichloroisoquinoline with suitable arylboronic acids. The new ligands prepared in this manner were resolved either via molecular complexation with N-benzylcinchonidinium chloride as with 1-[3-(2-hydroxyphenyl)isoquinolin-1-yl]naphthalen-2-ol or via chromatographic separation of its epimeric camphorsulfonates as for 1,3-bis-(2-hydroxynaphthalen-1-yl)isoquinoline. 4-tert-Butyl-2-chloro-6-[1-(2-hydroxymethylnaphthalen-1-yl)isoquinolin-3-yl]phenol was resolved by chiral semi-preparative HPLC. The application of these ligands in the diethylzinc addition to aldehydes was investigated. In certain cases, the desired secondary alcohols were obtained in high yield with excellent enantiomeric excess (ee?>?99%) at low catalyst loading (1?mol%).     

Asymmetric Synthesis of Novel Vicinal Amino Alcohols via Intramolecular Ketone-N-sulfinylimine Pinacol-Type Reductive Coupling Promoted by SmI2

A novel intramolecular asymmetric ketone-N-sulfinylimine pinacol-type reductive coupling reaction induced by SmI₂ was reported. A series of 1-amino-1,2,3,4-tetrahydronaphthalen-2-carbinols were obtained in moderate to good yields with excellent ee and high dr.

[Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications® for the following free supplemental resource(s): Full experimental and spectral details.]     

Selective reaction of camphor-derived exo-formyl [2.2.1]bicyclic carbinol with alkyl primary amines: application to the preparation of new chiral catalysts for asymmetric reduction of aryl ketones

Reaction of camphor-derived exo-formyl [2.2.1]bicyclic carbinol with various alkyl primary amines gave regio- and stereo-specific [3.2.1]bicyclic α-amino ketones. A detailed mechanism of the reaction was discussed. This reaction was further applied to the preparation of some camphor-derived oxazaborolidines, one of which proved to be an efficient chiral catalyst for the asymmetric borane reduction of prochiral aryl ketones at room temperature.