A direct, highly convergent route to α-methylene-γ-lactones fused to medium and large rings
作者:Leo A. Paquette、José Méndez-Andino
DOI:10.1016/s0040-4039(99)00781-9
日期:1999.6
A general procedure for the synthesis of α-methylene lactones cis- or trans-fused to larger rings is described. The convenient approach originates with two ω-unsaturated aldehydes of the same or different chain length.
reaction into a functionalized allylic bromide. Merger of the two building blocks is subsequently accomplished in aqueous solution with powdered indium metal serving as the initiator. Once the lactone ring is crafted, the end products are generated by application of ring-closingmetathesis. The central issues surrounding this final step are the effects of the stereochemical disposition of the side chains