Efficient Synthesis of Butenolide−Medium Ring Ether Hybrids by a [3 + 2] Cyclization-Ring-Closing Metathesis Strategy
作者:Peter Langer、Tobias Eckardt、Martin Stoll
DOI:10.1021/ol006307k
日期:2000.9.1
GRAPHICSA new strategy for the synthesis of bicyclic gamma-alkylidenebutenolides, butenolide-medium ring ether hybrids, is reported which involves Me3SiOTf-catalyzed cyclization of 1,3-bis(trimethylsilyloxy)-1,3 butadienes with oxalyl chloride, Mitsunobu reaction, and subsequent ring-dosing metathesis.
New Strategies for the Efficient Synthesis of Medium-Sized Bicyclic γ-Alkylidenebutenolides Based on Regioselective Cyclizations of 1,3-Bis(trimethylsilyloxy)-1,3-butadienes with Oxalyl Chloride
作者:Peter Langer、Tobias Eckardt、Nehad N. R. Saleh、Inass Karimé、Peter Müller
efficiently prepared by Me3SiOTf-catalyzed cyclization of cyclic bis(silyl enol ethers) with oxalyl chloride. In addition, a new strategy for the synthesis of medium-sized bicyclic hybrids of butenolides and medium-sized cyclic ethers− based on sequential [3+2] cyclization of 1,3-bis(trimethylsilyloxy)-1,3-butadienes, Mitsunobu reaction, and ring-closing metathesis − is reported.