A chemoenzymatic total synthesis of the undecenolide (−)-cladospolide B via a mid-stage ring-closing metathesis and a late-stage photo-rearrangement of the E-isomer
作者:Kerrie A. B. Austin、Martin G. Banwell、David T. J. Loong、A. David Rae、Anthony C. Willis
DOI:10.1039/b417685e
日期:——
A sixteen-step synthesis of the twelve-membered macrolide (-)-cladospolide B(2) from the microbially-derived cis-1,2-dihydrocatechol 5 is described. Pivotal steps include the ring-closing metathesis (RCM) of diene 12 to give the ten-membered lactone 13 together with small amounts of the head-to-tail and head-to-head dimers 14 and 15, respectively. The saturated lactol 19 derived from compounds 13 and