In the presence of a chiral promoter consisting of tin(II) triflate, a chiral diamine, and tributylin fluoride, the silyl enol ether of S-ethyl ethanethioate or S-tert-butyl ethanetioate reacts with aldehydes to afford the corresponding aldol-type adducts in good yields with high enantioselectivities. In the reaction of silyl enol ether of S-ethyl propanethioate with aldehydes, perfect stereochemical
在由三氟甲磺酸锡 (II)、手性二胺和氟化三丁锡组成的手性促进剂存在下,乙硫酸 S-乙基或乙硫酸 S-叔丁酯的甲硅烷基烯醇醚与醛反应得到相应的醛醇型加合物产率高,对映选择性高。在硫代丙酸乙酯的甲硅烷基烯醇醚与醛的反应中,通过三氟甲磺酸锡 (II)、手性二胺和二乙酸二丁酯的组合使用,实现了完美的立体化学控制。多种醛,包括脂肪醛、α,β-不饱和醛和芳香醛,都适用于该反应。手性促进剂的特征在于 119 Sn NMR 光谱,并证明形成了三组分配合物,其行为类似于手性路易斯酸。
The catalytic asymmetric aldol reaction of aldehydes with unsubstituted and monosubstituted silyl ketene acetals: formation of anti-β-hydroxy-α-methyl esters
作者:Emma R. Parmee、Yaping Hong、Orin Tempkin、Satoru Masamune
DOI:10.1016/s0040-4039(00)91717-9
日期:1992.3
The title reaction with unsubstituted and monosubstituted silyl ketene acetals proceeds with high enantioselectivity, and in the latter case good diastereoselectivity favoring the anti-β-hydroxy-α-methyl esters in all reported cases.
Asymmetric Aldol Reaction of Silyl Enol Ethers with Aldehydes Promoted by the Combined Use of Chiral Diamine Coordinated Tin(II) Triflate and Tributyltin Fluoride
作者:Shu Kobayashi、Teruaki Mukaiyama
DOI:10.1246/cl.1989.297
日期:1989.2
Asymmetric aldol reaction of silylenolethers of thioesters with aldehydes is performed, in high enantiomeric exess by the use of a new chiral promoter, a combined use of chiral diamine coordinated tin(II) triflate and tributyltinfluoride.
通过使用新的手性促进剂、手性二胺配位的三氟甲磺酸锡 (II) 和氟化三丁基锡的组合使用,硫酯的甲硅烷基烯醇醚与醛的不对称羟醛反应以高对映体形式进行。
Pronounced Solvent and Concentration Effects in an Enantioselective Mukaiyama Aldol Condensation Using BINOL-Titanium(IV) Catalysts
作者:Gary E. Keck、Dhileepkumar Krishnamurthy
DOI:10.1021/ja00113a031
日期:1995.3
KOBAYASHI, SHU;MUKAIYAMA, TERUAKI, CHEM. LETT.,(1989) N, C. 297-300