Reported herein is a general approach to optically active isoflavanes based on a chiral amine-catalyzed [4 + 2] asymmetric annulation of o-quinone methides and aldehydes. A number of naturally occurring isoflavanes, including equol, sativan, isosativan, vestitol and medicarpin, as well as isoflavane analogues were readily prepared with good to excellent enantioselectivities.
本文报道的是基于手性胺催化的邻醌甲基化物和醛的[4 + 2]不对称环空的旋光异
黄酮的一般方法。易于制备具有良好至优异对映选择性的许多天然存在的异
黄酮,包括
雌马酚,sativan,isosativan,vestitol和medicarpin,以及异黄烷类似物。