Thiolysis of oxazolines: A new, selective method for the direct conversion of peptide oxazolines into thiazolines
作者:Peter Wipf、Chris P. Miller、Srikanth Venkatraman、Paul C. Fritch
DOI:10.1016/0040-4039(95)01322-9
日期:1995.9
A direct oxazoline→thiazoline conversion can be realized by thiolysis of oxazolines with H2S in methanol/triethylamine, followed by cyclodehydration with Burgess reagent. This protocol is high-yielding, chemoselective, and essentially free of racemization for C(5)-unsubstituted and trans-4,5-disubstituted peptide oxazolines. Thioamide intermediates are obtained regioselectively, thus the thiolysis