Aiguade J, Hao J, Forsyth C J
Department of Chemistry, University of Minnesota, Minneapolis, Minnesota, Minnesota 55455, USA.
Org Lett. 2001 Apr 5;3(7):979-82.
[structure: see text]. An effective approach to form a 1,3-disubstituted 2,9-dioxabicyclo[3.3.1]nonane system representing the core of the F and G rings (C28-C34) of the azaspiracid natural products has been developed. The double intramolecular hetero-Michael addition (DIHMA) of a diol upon an ynone generated the bicyclic ketal in a highly diastereoselective fashion.
[结构:见正文]。已开发出一种有效的方法来形成1,3-二取代的2,9-二氧杂双环[3.3.1]壬烷体系,该体系代表氮杂螺旋酸天然产物的F环和G环(C28-C34)的核心。二醇对炔酮的双分子内杂迈克尔加成(DIHMA)以高度非对映选择性的方式生成双环缩酮。