Construction of Substituted Cyclohexanones by Reductive Cyclization of 7-Oxo-2,8-alkadienyl Esters
作者:Theodore M. Kamenecka、Larry E. Overman、Sylvie K. Ly Sakata
DOI:10.1021/ol0169325
日期:2002.1.1
8-alkadienyl esters upon reaction with triphenylphosphinecopper hydride hexamer stereoselectively yields substituted cyclohexanones having a cis relationship of carbon side chains at C2 and C3. This cyclohexanone construction is particularly useful for preparing 4-alkoxy- or 4-siloxy-2,3-disubstituted cyclohexanones, in which instance stereoselection is > or = 20:1.
[反应:见正文]与三苯基膦铜氢化物六聚物立体反应时,对7-氧代-2,8-链二烯基酯的环化反应选择性地产生了取代的环己酮,其在C2和C3处具有碳侧链的顺式关系。这种环己酮结构对于制备4-烷氧基-或4-甲硅烷氧基-2,3-二取代的环己酮特别有用,在这种情况下立体选择为>或= 20:1。