Asymmetric Synthesis of (S)-Norlaudanosine and (S)-Tetrahydrohomopapaverine by Catalytic Asymmetric Hydrogenation with Chiral Diphosphine-Iridium(I)-Phthalimide Complex Catalysts
摘要:
Optically active 1,2,3,4-tetrahydroisoquinoline alkaloids, (S)-norlaudanosine and (S)-tetrahydrohomopapaverine, were prepared by catalytic asymmetric hydrogenation of 1-substituted 3,4-dihydro-6,7-dimethoxyisoquinolines with 1 mol % of an iridium(I) complex of (2S,4S)-BCPM or (S)-BINAP in the presence of a phthalimide. Enantioselectivities of up to 88% ee were attained.
1,2,3,4-Tetrafluoroanthraquinone has been synthesized and some of its reactions studied Further reactions of tetrafluorophthalic acid and its derivatives are reported.