CrCl2 mediated allylation of N-protected α-amino aldehydes. A versatile synthesis of polypeptides containing an hydroxyethylene isostere
作者:Paola Ciapetti、Maurizio Taddei、Paola Ulivi
DOI:10.1016/s0040-4039(00)76862-6
日期:1994.5
intermediate products for the synthesis of hydroxyethylene dipeptideisosteres. The low stereoselectivity of this reaction can be improved using aldehydes protected with hindered groups. This reaction can be efficiently applied to oligopetide aldehydes. We describe a protocol, for the preparation of peptides containing an hydroxyethylene isostere, which allows a rapid variations of the aminoacid sequence
CrCl2 Mediated addition of allylic halides or phosphates to N-protected α-amino aldehydes. Stereocontrolled synthesis of a new core for C2 symmetric HIV-protease inhibitors
作者:Paola Ciapetti、Massimo Falorni、Maurizio Taddei
DOI:10.1016/0040-4020(96)00258-x
日期:1996.5
The addition of gamma-monosubstituted allylchromium(lll) reagents to N-protected alpha-amino aldehydes proceeds in a stereoconvergent manner in contrast with the case of the unsubstituted reagents, where the stereoselectivity depends on the nature of the group bonded to the nitrogen. The chromium(III) reagent derived from 3-chloromethyl-2-trimethylsilyl-1-propene was used to prepare a C-2 symmetric HIV-protease inhibitor. Copyright (C) 1996 Elsevier Science Ltd