Catalytic asymmetric epoxidation of unfunctionalized alkenes using the first D4-symmetric metallotetraphenylporphyrin
作者:Ronald L. Halterman、Shyi Tai Jan
DOI:10.1021/jo00018a008
日期:1991.8
The condensation of the resolved C2-symmetric benzaldehyde, 1,2,3,4,5,6,7,8-octahydro-1:4,5:8-dimethanoanthracene-9-carboxaldehyde, with pyrrole produced a new chiral tetraphenylporphyrin exhibiting D4 symmetry. A manganese chloride complex of this porphyrin was used as a catalyst (0.5 mol %) for the asymmetric epoxidation of aromatic-substituted alkenes in the presence of excess sodium hypochlorite, providing for terminal or Z alkene yields above 90% and enantioselectivities ranging from 41 to 76% ee.