diboronates (BPDB) is reported. Under Lewis acid activation, they can catalyze highly exo-selective and enantioselective Diels–Alder reactions. For diactivated dienophiles, BPDB can also selectively activate one of the two carbonyl groups based on steric effect, resulting in highly regioselective asymmetric Diels–Alder reactions.
报道了一系列易于合成、空气和
水分稳定的新化合物,称为双
吡咯烷二
硼酸盐(BPDB)。在
路易斯酸活化下,它们可以催化高度外型选择性和对映选择性狄尔斯-阿尔德反应。对于双活化亲双烯体,BPDB 还可以基于空间效应选择性地激活两个羰基之一,从而导致高度区域选择性的不对称狄尔斯-阿尔德反应。