Enantio- and diastereoselectivity in the reduction of spiro[4.5]decane-1,4-dione derivatives with baker's yeast
作者:Yan-Yi Zhu、D. Jean Burnell
DOI:10.1016/0957-4166(96)00430-2
日期:1996.11
Reductions mediated by baker's yeast were carried out on five spiro[4.5]decane-1,4-dione derivatives 4, 9, 12, 15, and 18. Enantioselectivity was always very high, but this did not correlate with the facial diastereoselectivity, which ranged from very high to zero. In some instances, the facial selectivity of the yeast-mediated reduction was lower than that of NaBH4. The reduction product of 4 was
通过面包酵母介导的减少是在五个螺[4.5]癸烷-1,4-二酮衍生物进行4,9,12,15,和18。对映选择性一直很高,但这与面部非对映选择性无关,其范围从非常高到零。在某些情况下,酵母介导的还原反应的面部选择性低于NaBH 4。4的还原产物在几个步骤中转化为对映体富集的双环中间体5形式,用于合成角三喹烷戊烯1。酵母介导的螺酮21还原 证明了赤道羰基的还原是非常优选的反应方式。