Chemoselective Synthesis of N-Terminal Cysteinyl Thioesters via β,γ-C,S Thiol-Michael Addition
作者:Rita Petracca、Katherine A. Bowen、Lauren McSweeney、Siobhan O’Flaherty、Vito Genna、Brendan Twamley、Marc Devocelle、Eoin M. Scanlan
DOI:10.1021/acs.orglett.9b01013
日期:2019.5.3
Dehydroalanine (ΔAla) is a highly electrophilic residue that can react efficiently with sulfur nucleophiles to furnish cysteinyl analogues. Herein, we report an efficient synthesis of N-terminal cysteinyl thioesters, suitable for S,N-acyl transfer, based on β,γ-C,S thiol-Michael addition. Both ionic and radical-based methodologies were found to be efficient for this process.
脱氢丙氨酸(ΔAla)是高度亲电的残基,可与硫亲核试剂有效反应,提供半胱氨酰类似物。本文中,我们报告了基于β,γ-C,S硫醇-迈克尔加成法的N端半胱氨酸硫酯的有效合成方法,适用于S,N-酰基转移。发现基于离子方法和基于自由基的方法对于该过程都是有效的。