oxazolidinones and their use in asymmetric solution-phase mixture aldol reactions. Through the use of such oxazolidinones based on tyrosine four different individually tagged aldoladducts were obtained as a mixture, chromatographically demixed, detagged, and it was shown that these processes gave the desired aldol products in good yield and enantioselectivity.
La configuration absolue est controlee par le choix du centre ion (M=B, Li ou Sn(IV)) de l'enolate des N-acylsultames
La configuration absolue est controlee par le choix du center ion (M=B, Li ou Sn(IV)) de l'enolate des N-acylsultames
Surface-Mediated Solid Phase Reaction. IX. A Convenient Procedure for Aldol Reaction of Ketene Silyl Acetals with Aldehydes on the Solid Surface of Alumina
作者:Brindaban C. Ranu、Manika Saha、Sanjay Bhar
DOI:10.1080/00397919708005012
日期:1997.9
The aldol reaction of ketene silyl acetals with aldehydes proceeds efficiently on the solid surface of alumina impregnated with anhydrous zinc chloride under sonication providing aldol products in high yields and with good stereoselectivity.
Canceill,J. et al., Bulletin de la Societe Chimique de France, 1966, p. 2653 - 2658
作者:Canceill,J. et al.
DOI:——
日期:——
Design of .alpha.-alkyl-.beta.-hydroxy esters suitable for providing optical resolution by lipase hydrolysis
A study of the lipase-catalyzed hydrolyses of various alpha-substituted beta-acetoxy esters revealed that a sulfur functional group in the ester, which could play an important role in the stereorecognition by lipase A6 (Aspergillus sp.) and an anti conformation in the ester, promotes satisfactory results in the hydrolysis.