Enantioselective Diels–Alder Reaction Induced by Chiral Supramolecular Lewis Acid Catalysts Based on CN···B and PO···B Coordination Bonds
作者:Kazuaki Ishihara、Manabu Hatano、Kazushi Hayashi、Tatsuhiro Sakamoto、Yuma Makino
DOI:10.1055/s-0035-1561362
日期:——
supramolecular boron Lewis acid catalysts were prepared from chiral 3-phosphoryl-1,1′-bi-2-naphthols, (2-cyanophenyl)boronic acids, and tris(pentafluorophenyl)borane, bound through CN···B and PO···B coordination bonds. In particular, the coordinated tris(pentafluorophenyl)boranes increase the Lewis acidity of the active center in the manner of a Lewis acid assisted Lewis acid catalyst system. A possible
以手性3-磷酰基-1,1'-双-2-萘酚、(2-氰基苯基)硼酸和三(五氟苯基)硼烷为原料,通过CN…B和PO·结合制备手性超分子硼路易斯酸催化剂··B协调键。特别是,配位的三(五氟苯基)硼烷以路易斯酸辅助路易斯酸催化剂体系的方式增加了活性中心的路易斯酸度。这些催化剂中可能存在的空腔非常适合丙烯醛与环状或非环状二烯的几种 Diels-Alder 探针反应,从而以良好到高产率和高对映选择性得到相应的加合物。