Synthesis of a Lactone Diastereomer of the Cembranolide Uprolide D
作者:James A. Marshall、Céline A. Griot、Harry R. Chobanian、William H. Myers
DOI:10.1021/ol101776e
日期:2010.10.1
A convergent stereoselective synthesis of a C1/C14 bis-epimer of uprolide D is described in which an intramolecular Barbier-type reaction was employed for macrocyclization with concomitant introduction of the C1 and C14 stereocenters of a fused α-methylene lactone ring through an anti-Felkin−Anh transition state. Unlike previous examples of allyl chromium additions, none of the Felkin−Anh derived adduct