Decarboxylative Radical Addition to Methylideneoxazolidinones for Stereocontrolled Synthesis of Selectively Protected Diamino Diacids
作者:Yu-Ting Hsiao、Jonathan Beadle、Cameron Pascoe、Ritesh Annadate、John C. Vederas
DOI:10.1021/acs.orglett.1c02684
日期:2021.9.17
can be achieved by redox decarboxylation of distal N-hydroxyphthalimide esters of protected aspartic, glutamic or α-aminoadipic acids via radical addition to methylideneoxazolidinones. The products are useful for solid-supported syntheses of robust bioactive carbocyclic peptide analogs. Yields of reactive primary radical addition are superior to those of more stabilized radicals, and the reaction fails
Electrophilic sulfenylation in a stereocontrolled synthesis of protected (2R,3R)-3-mercaptoaspartic acid from -aspartic acid
作者:Norio Shibata、Jack E. Baldwin、Adam Jacobs、Mark E. Wood
DOI:10.1016/0040-4020(96)00765-x
日期:1996.9
A novel electrophilic sulfenylating agent, (2,4-dimethoxybenzylthio)-4-methylphenyl sulfonate (13) was developed to give thiols bearing an acid labile protecting group. This was subsequently used to prepare in a stereocontrolled manner, a protected form of (2R,3R)-3-mercaptoaspartic acid which was incorporated into a tripeptide. Copyright (C) 1996 Published by Elsevier Science Ltd
An unexpected product from attempted reductive etherification of a silyl alcohol with an aldehyde
作者:Christopher G.H. White、Alethea B. Tabor
DOI:10.1016/j.tet.2007.03.163
日期:2007.7
Reductive etherification, using BiBr3/Et3SiH, between two modified amino acids, one with a silyl alcohol side chain and one with an aldehyde side chain, gave, not the desired bis-amino acid, but a tetrahydrooxazine, in good yield. (c) 2007 Elsevier Ltd. All rights reserved.