Synthesis of enantiopure cyclic amino acid derivatives via a sequential diastereoselective Petasis reaction/ring closing olefin metathesis process
摘要:
A novel approach to the synthesis of enantiopure cyclic amino esters is reported. The utilization of allyl-boronic acid together with (S)-alpha-methylbenzylamine as a chiral auxiliary in the Petasis/Mannich reaction led to the formation of allylglycine derivatives in good yield and with high diastereoselectivity. Subsequent esterification, N-allylation followed by ring-closing metathesis (RCM) reaction enabled the preparation of enantiomerically pure cyclic a-amino acid derivatives. (C) 2017 Elsevier Ltd. All rights reserved.