摘要:
An efficient synthesis of the C-1-C-14 Subunit resident in (-)-lasonolide A is reported herein. The key reaction features that were utilized include a Molander-Reformatsky SmI2 mediated intramolecular aldol reaction followed by a diastereoselective target oriented beta-C-glycoside formation sequence. Lastly, a chemo- and diastereoselective cross-metathesis of a terminal olefin in the presence of a trisubstituted alkene with acrolein and subsequent olefination of the aldehyde moiety allowed for the completion of the (E,E)-diene side chain. (c) 2005 Published by Elsevier Ltd.