β-Lactam synthesis: Chemospecific sulfonation and cyclization of the β-hydroxyvaline nucleus
作者:W.A Slusarchyk、T Dejneka、J Gougoutas、W.H Koster、D.R Kronenthal、M Malley、M.G Perri、F.L Routh、J.E Sundeen、E.R Weaver、R Zahler、J.D Godfrey、R.H Mueller、D.J Von Langen
DOI:10.1016/s0040-4039(00)84643-2
日期:1986.1
intramolecular cyclization of “hydroxamate” using Mitsunobu conditions was inefficient for the formation and isolation of the C-4 dimethyl monobactam . However, chemospecific O-sulfonation of 1 and subsequent cyclization with base provides a useful method for β-lactam synthesis from a sterically hindered β-hydroxy amino acid. Competitive rearrangement of also occurs during cyclization providing isomeric
使用Mitsunobu条件的“异羟肟酸酯”的分子内环化对于形成和分离C-4二甲基单bactam效率低下。然而,1的化学特异性O磺化以及随后的碱环化为从位阻β-羟基氨基酸合成β-内酰胺提供了一种有用的方法。在环化过程中也会发生竞争性重排,提供异构体β-内酰胺。