New, recoverable and highly effective sulfinyl chiral auxiliary
摘要:
A facile synthesis of a bicyclic 8-menthylsulfinate is described. The reaction of this sultine with organometallic compounds leads to gamma-hydroxysulfoxides, while the reaction with lithium amide affords 8-menthylsulfinamide. The chiral efficiency of the 8-menthylsulfinyl auxiliary was tested in the reaction of sulfinimines with Grignard reagents. A highly stereoselective addition of ethylmagnesium bromide to 8-menthylsulfinimine was observed (98% de). (C) 2003 Elsevier Ltd. All rights reserved.
New reagent for the optical resolution of ketones: (−) (1R, 2R, 5R)-5-methyl-2-(1-mercapto-1-methylethy)-cyclohexanol. Application to trans dimethyl cyclopentanone-3,4-dicarboxylate.