Exposure of monoenone monoketones to catecholborane in THF at ambient temperature results in tandem 1,4-reduction-aldol cyclization. For aromatic and heteroaromatic enones, six-membered cyclic aldol products are formed in excellent yield with high levels of syn diastereoselectivity. Five-membered ring formation proceeds less readily, but the yield of cyclized product is improved through introduction
在环境温度下将单烯酮单酮暴露于THF中的
邻苯二酚硼烷中会导致串联1,4-还原-醛醇环化。对于芳族和杂芳族烯酮,以优异的收率和高
水平的非对映选择性形成了六元环状羟醛产物。五元环的形成较不容易进行,但通过引入Rh(I)盐可提高环化产物的收率。