Ring-Closing Metathesis Reactions of Acyloxysulfones: Synthesis of γ-Alkylidene Butenolides
作者:Gregory O’Neil、Iris Phan、Garrett Gilbert
DOI:10.1055/s-0034-1378721
日期:——
An acyloxysulfone ring-closing metathesis/sulfone elimination sequence has been developed for the preparation of various γ-alkylidenebutenolides. The elimination is proposed to proceed via an E1cb mechanism leading to (Z)-γ-alkylidene butenolides as the major products.
cycloadditions of dienes to some 5-ylidene-2(5)-furanones have been examined from experimental and theoretical points of view. The role that different substituents play on directing the observed site-selectivity (endocyclic or exocyclic doublebond at the dienophile counterpart) is discussed. Several new potential synthetic building blocks have been prepared in good yields.