A new and efficient preparation of α,β-dehydroamino acids
作者:Karen Goodall、Andrew F Parsons
DOI:10.1016/0040-4039(95)00459-p
日期:1995.5
A new one-pot synthesis of dehydroamino acids has been developed by reaction of β-hydroxy-α-amino acids with dichloroacetyl chloride and a tertiary amine base. The reaction proceeds in 58–89% yield.
New route to pyroglutamates viaα-chloro amide radical cyclisation
作者:Karen Goodall、Andrew F. Parsons
DOI:10.1039/p19940003257
日期:——
The tributyltin hydride mediated radicalCyclisation of N-(α-chloroacetamido)dehydroalanine derivatives prepared from serine proceeds regioselectively to give pyroglutamates in 47–74% yield– the cyclisation of the intermediate carbamoylmethyl radical proceeds in a ‘disfavoured’ 5-endo-trig manner.