The present invention relates to a synthesis of chromanones or chromanes in a stereospecific matter in view of the 2-position in the chromanone or chromane ring. It has been found that this synthesis is particularly possible in the presence of a chiral compound of a specific type and of at least one Bransted acid or in the presence a specific chiral compound having a Bransted acid functional group in the molecule.
本发明涉及在考虑到2-位置的立体特异性情况下合成
香豆酮或香豆烷,发现在特定类型的手性化合物和至少一种布朗斯特酸的存在下,或在分子中具有布朗斯特酸官能团的特定手性化合物的存在下,这种合成特别可能实现。