Catalytic iron-mediated ene carbocyclizations of trienes: enantioselective syntheses of the iridoid monoterpenes (−)-mitsugashiwalactone and (+)-isoiridomyrmecin
作者:James M. Takacs、Young Chan Myoung
DOI:10.1016/s0040-4039(00)74120-7
日期:1992.1
The iron-catalyzed cycloisomerization of a chiral (2E,7E) 2,7,9-decatriene derivative bearing a methyl substituent adjacent to the 1,3-diene subunit proceeds with high levels of 1,2-stereoinduction relative to the resident methyl-bearing stereocenter. The stereochemistry of the chiral cyclopentane product is proven by conversion to (−)-Mitsugashiwalactone (1) and to (+)-Isoiridomyrmecin (2).
相对于驻留的甲基-甲基,手性(2E,7E)2,7,9-癸三烯衍生物带有一个与1,3-二烯亚基相邻的甲基取代基的铁催化的环异构化反应以高水平的1,2-立体诱导作用进行轴承立体中心。手性环戊烷产物的立体化学可通过转化为(-)-三菱芥酸内酯(1)和(+)-异丁香霉素(2)来证明。