The tert-butyl sulfoximine group as an effective ortho-director of lithiation: ortho-metallated S-(tert-butyl)-S-phenylsulfoximines
作者:V. Levacher、B.Langer Eriksen、M. Begtrup、G. Dupas、G. Quéguiner、J. Duflos、J. Bourguignon
DOI:10.1016/s0040-4039(99)00060-x
日期:1999.2
The readily available S-(tert-butyl)-N-(trimethylsilyl)-S-phenylsulfoximine was prepared from S-methyl-N(trimethylsilyl)-S-phenylsulfoximine via lithiation-methylation sequences. The reaction with n-butyllithium in THF at -78 degrees C afforded the corresponding ortho-lithiated species which could be trapped with different electrophiles in good yields. Addition of benzaldehyde proceeded with a modest diastereoselectivity (de=52%). (C) 1999 Published by Elsevier Science Ltd. All rights reserved.