Molecular recognition by artificial chiral catalysts utilizing a metal chelate. A remarkable difference in reactivity between geometrical isomers of silyl enolates in asymmetric aldol reactions using chiral tin(II) catalysts
作者:Shū Kobayashi、Mineko Horibe、Iwao Hachiya
DOI:10.1016/0040-4039(95)00505-7
日期:1995.5
remarkable difference in reactivity between (E)- and (Z)-enolates in the asymmetricaldolreactions of silyl enolates with aldehydes using chiral tin(II) Lewis acids was found. This difference can be interpreted to mean that the chiral catalyst coordinated by aldehydes via a metal chelate recognizes the geometry of the silyl enolates.
Chiral tin(II) Lewis acid-mediated enantioselective aldol reactions: synthesis of both enantiomers using similar types of chiral sources
作者:Shū Kobayashi、Mineko Horibe
DOI:10.1016/0957-4166(95)00335-m
日期:1995.10
Chiral tin(II)-Lewis acid-mediated aldol reactions of various enolates with an aldehyde were investigated by using chiral diamine 2. Based on these reactions, both enantiomers of aldol adducts were prepared using similar types of chiral sources.
Highly Enantioselective Synthesis of syn-α,β-Dihydroxy Thioesters by the Asymmetric Aldol Reaction Using a Chiral Tin(II) Lewis Acid
作者:Teruaki Mukaiyama、Isamu Shiina、Shu Kobayashi
DOI:10.1246/cl.1991.1901
日期:1991.11
syn-α,β-Dihydroxy thioesters are prepared in good yields with high diastereo- and enantioselectivities by the asymmetric aldol reaction of 1-trimethylsiloxy-1-ethylthio-2-t-butyldimethylsiloxyethene with aldehydes using a chiral promoter consisting of tin(II) triflate, a chiral diamine and dibutyltin diacetate.
使用由锡 (II) 组成的手性促进剂,通过 1-三甲基甲硅烷氧基-1-乙硫基-2-叔丁基二甲基甲硅烷氧基乙烯与醛的不对称醛醇反应,以高产率和高非对映选择性和对映选择性制备了合成-α,β-二羟基硫酯三氟甲磺酸酯,一种手性二胺和二乙酸二丁基锡。
of a chiral tin(II) Lewis acid, the silyl enol ether derived from (E)-phenyl α-t-butyldimethylsiloxyacetate reacted with aldehydes to afford the corresponding anti-aldol adducts, anti-α,β-dihydroxy ester derivatives, in high yields with high diastereo- and enantioselectivities.
Preparation of both enantiomers of 2-methyl-3-hydroxythioesters based on chiral Lewis acid-controlled synthesis
作者:Shu Kobayashi、Mineko Horibe
DOI:10.1016/0040-4020(96)00251-7
日期:1996.5
Bothenantiomers of 2-methyl-3-hydroxythioesters have been synthesized by using chiral tin(II) Lewis acid-mediated aldol reactions of (Z)-1-ethylthio-1-trimethylsiloxypropene (4) with aldehydes, based on chiral Lewis acid-controlled synthesis. The key to this synthesis is in choosing similar types of chiral sources, (S)-1-methyl-2-[(1-benz[cd]indolinyl]pyrrolidine (3) and (S)-1-methyl-2-[(1-naphth
2-甲基-3-羟基硫代酸酯的两种对映异构体均是基于手性路易斯酸-的手性锡(II)路易斯酸介导的(Z)-1-乙基硫基-1-三甲基甲硅烷氧基丙烯(4)与醛的醛醇缩合反应合成的。受控合成。合成的关键是选择类似类型的手性来源,(S)-1-甲基-2-[(1-苯并[ cd ]吲哚基]吡咯烷(3)和(S)-1-甲基-2- [ (1-萘基氨基)甲基]吡咯烷(5),衍生自L-脯氨酸,还描述了在不对称醛醇缩合反应中新的手性配体3的评价。