The present invention relates to the preparation of chromane compounds and their derivatives by a copper-catalyzed conjugate addition reaction. It has been observed that in highly stereoselective manner a methyl group can be introduced to the 2 position of chromane ring by reaction of a chromenone with Al(CH3)3 in the presence of a Cu(I) salt and specific chiral phosphoramidites. The compounds obtained are important intermediates particularly for the synthesis of chiral tocopherols.
本发明涉及通过
铜催化的共轭加成反应制备色满化合物及其衍
生物。观察到,在高度立体选择性的方式下,通过色满酮与
三甲基铝在
铜(I)盐和特定手性
磷酰胺的存在下反应,可以将甲基引入到色满环的2位。所得到的化合物是重要的中间体,特别适用于合成手性
生育酚。