�ber einen neuartigen synthetischen Zugang zu ?,?-unges�ttigten ?-Aminocarbons�uren
作者:Franz Heinzer、Daniel Bellu?
DOI:10.1002/hlca.19810640734
日期:1981.11.4
A New Synthetic Route to β,α‐Unsaturated α‐Amino AcidsA versatile new synthetic pathway for the preparation of βγ‐unsaturated α‐amino acids (1) is presented. Cu(I)‐catalyzed addition of ethyl isocyanoacetate (2) to α‐chloro carbonyl compounds (3) gives 5‐chloroalkyl‐2‐oxazolin‐4‐carboxylates (4) in high yields. A reductive elimination on 4 by means of zinc yields the N‐formyl derivatives of βγ‐unsaturated α‐amino carboxylates (5), which on acid hydrolysis lead to the free amino acids 1. The five different βγ‐dehydro‐α‐amono acids 1b‐1f have been prepared by this method.