Synthesis of conformationally constrained ⍺-imino acid derivatives via ring-closing metathesis

Abstract

Conformationally constrained amino acid derivatives are useful in the synthesis of peptidomimetics. Seven-, and eight-membered conformationally constrained ⍺-imino acid derivatives have been prepared via RCM (ring-closing metathesis). Interestingly, attempts to achieve the synthesis of nine-membered imino acid derivative resulted in the formation of dimeric, 18-membered macrocyclic bis-⍺-imino acid derivative.