α-Thiosubstituted chiral imines/secondary enamines: their use in the asymmetric Michael reaction
摘要:
The asymmetric Michael reaction between 2-thiosubstituted chiral imines/secondary enamines derived from (S)I-phenylethylamine and electrophilic alkenes (methyl acrylate, MVK) was investigated. 2-Phenylthio derivatives furnished the expected Michael adducts with excellent ee. By contrast, an in situ elimination of p-toluenesulfenic acid took place when using the p-toluenesulfinyl analogs. (C) 2000 Elsevier Science Ltd. All rights reserved.
Stereocontrolled Reduction of 2-(p-Tolylsulfinyl)cycloalkanones under Basic Conditions: π-Facial Selection in Cyclic Systems Directed by a Chiral Side Chain
Preparation of α-Toluenesulfinyl Ketones via Enolate Condensation with Methyl<i>p</i>-Toluenesulfinate
作者:Robert M. COATES、H. Dale PIGOTT
DOI:10.1055/s-1975-23741
日期:——
Phase Transfer Catalysis (PTC) Sulfanylation of Some 2-Methylsulfinyl-Cyclanones
作者:Blanka Wladislaw、Mauro Alves Bueno、Liliana Marzorati、Claudio Di Vitta、Júlio Zukerman-Schpector
DOI:10.1021/jo048751x
日期:2004.12.1
The sulfanylation reactions of 2-methylsulfinylated cyclopentanone, 1-indanone, and cyclohexanone by a PTC procedure are reported and the yields and diastereoselectivity compared to those obtained by the homogeneousphase method. The stability of the sulfanylated methylsulfinyl derivatives at room temperature versus the instability of the p-tolylsulfinyl derivatives is also reported.