Intramolecular Nicholas Reaction: Stereoselective Synthesis of 5-Alkynylproline Derivatives
作者:J. Nicolás Hernández、Miguel A. Ramírez、Matías L. Rodríguez、Víctor S. Martín
DOI:10.1021/ol800544a
日期:2008.6.1
The intramolecular Nicholasreaction of propargylicalcohols derived from N, N-acyl-diprotected omega-semialdehydes obtained from glutamic acid provided stereoselectively 5-alkynylproline derivatives. The suitable choice of the N-protecting group (tosyl or benzoyl derivative) permitted control of the stereochemistry during the ring formation. Semiempirical calculations of the species involved in the