Expedient Enantioselective Synthesis of the Δ<sup>4</sup>-Oxocene Cores of (+)-Laurencin and (+)-Prelaureatin
作者:Jim Li、Judy M. Suh、Elbert Chin
DOI:10.1021/ol1021965
日期:2010.11.5
An expedient enantioselectivesynthesis of the Δ4-oxocene cores present in (+)-laurencin and (+)-prelaureatin was accomplished in eight steps via a novel one-pot regio- and stereoselective ring cyclization−fragmentation−expansion cascade from the tetrahydrofuran precursors which were prepared by stereocontrolled cyclization from vinylsilanes. This process is highlighted by an intramolecular oxo-carbenoid