Enantio- and Diastereoselective Synthesis of (<i>E</i>)-1,5-<i>syn</i>-Diols: Application to the Synthesis of the C(23)−C(40) Fragment of Tetrafibricin
作者:Jeremy Kister、Philippe Nuhant、Ricardo Lira、Achim Sorg、William R. Roush
DOI:10.1021/ol2003836
日期:2011.4.1
A highly stereoselective synthesis of (E)-1,5-syn-diols 6 Is described. The kinetically controlled hydroboration of allenyltrifluoroborate 8 with Soderquist borane 2 provides the (Z)-allylic trifluoroborate 9, which undergoes sequential allylboration with two different aldehydes to provide (E)-1,5-syn-diols 6 In 72-98% yields with > 95% ee and > 20:1 dr. Application of this method to the synthesis of the tetraflbricin C(23)-C(40) fragment 19 is described.