P. Langer et al., Efficient synthesis of butenolide-medium ring ether hybrids by a [3+2] cyclization-ring-closing metathesis strategy, ORG LETT, 2(19), 2000, pp. 2991-2993
GRAPHICS
A new strategy for the synthesis of bicyclic gamma-alkylidenebutenolides, b
utenolide-medium ring ether hybrids, is reported which involves Me3SiOTf-ca
talyzed cyclization of 1,3-bis(trimethylsilyloxy)-1,3 butadienes with oxaly
l chloride, Mitsunobu reaction, and subsequent ring-dosing metathesis.