Cis and Trans Selective 1,4-Addition of a Lithium Dithioester Enolate to 4-<i>O</i>-TBS-2-cyclohexenone
作者:Alan C. Spivey、Laetitia J. Martin、Damian M. Grainger、Jörg Ortner、Andrew J. P. White
DOI:10.1021/ol0611090
日期:2006.8.1
the lithium enolate of methyldithioacetate (LMDTA) to (+/-)-4-O-TBS-2-cyclohexenone (3) can be varied from being highly 3,4-trans selective to being highly 3,4-cis selective simply by varying the reaction temperature. This stereodivergency allows expedient syntheses of the corresponding trans and cis methyl esters 6t and 6c and derived bicyclic ketolactones 7t and 7c.
二硫代乙酸甲酯(LMDTA)的烯醇锂在(+/-)-4-O-TBS-2-环己烯酮(3)中的1,4-加成反应可以从高3,4-反式选择性变为高3简单地通过改变反应温度就可以选择性地对4-4-顺 该立体差异允许相应的反式和顺式甲酯6t和6c以及衍生的双环酮内酯7t和7c的方便合成。