Stereoselective addition reactions of chiral N-benzylidene-p-toluenesulfinamides. Asymmetric syntheses of .beta.- and .gamma.-amino acids
摘要:
Chiral N-benzylidene-p-toluenesulfinamides 2 were prepared by the reaction of benzonitrile with alkyllithium in ether followed by (-)-l-menthyl (S)-p-tolylsulfinate. Treatment of 2 with allylmagnesium bromide in ether at 0-degrees-C gave the adducts (R)-7 with excellent stereoselectivity. Pure chiral sulfinamides 7 were converted into chiral beta- and gamma-amino acids in four and five steps, respectively.
Stereoselective addition reactions of chiral N-benzylidene-p-toluenesulfinamides. Asymmetric syntheses of .beta.- and .gamma.-amino acids
摘要:
Chiral N-benzylidene-p-toluenesulfinamides 2 were prepared by the reaction of benzonitrile with alkyllithium in ether followed by (-)-l-menthyl (S)-p-tolylsulfinate. Treatment of 2 with allylmagnesium bromide in ether at 0-degrees-C gave the adducts (R)-7 with excellent stereoselectivity. Pure chiral sulfinamides 7 were converted into chiral beta- and gamma-amino acids in four and five steps, respectively.
Rare-Earth-Catalyzed Transsulfinamidation of Sulfinamides with Amines
作者:Daheng Wen、Qingshu Zheng、Chaoyu Wang、Tao Tu
DOI:10.1021/acs.orglett.1c01106
日期:2021.5.7
transsulfinamidation of primary sulfinamides with alkyl, aryl, and heterocyclicamines for the synthesis of diverse secondary and tertiary sulfinamides has been realized. Unlike transition metal-catalyzed cross-coupling approaches restricted to non-commercially available disubstituted O-benzoyl hydroxylamines, this newly developed protocol is suitable for diverse readily available primary and secondary amines without