Studies on tetrahydroisoquinolines. XXI. A synthesis of (.+-.)-1-hydroxy-2-methoxyhomoproaporphine and stereochemistry of 4-oxygenated 1,2,3,4-tetrahydroisoquinolines.
Studies on tetrahydroisoquinolines. XXI. A synthesis of (.+-.)-1-hydroxy-2-methoxyhomoproaporphine and stereochemistry of 4-oxygenated 1,2,3,4-tetrahydroisoquinolines.
Enzymatic resolution of acylates of prochiral phenolic 1-aryl- and 1-arylalkyl-1,2,3,4-tetrahydroisoquinolinols, which possess a guaiacol-type moiety, by use of immobilized lipase in organic solvent
Enzymatic resolution of acylates of prochiral phenolic 1-aryl- and 1-arylalkyl-1,2,3,4-tetrahydroisoquinolinols, which possess a guaiacol-type moiety by use of lipase immobilized with celite in water-saturated organic solvent gave the corresponding acylates and phenols in moderate optical yields.
US4202980A
申请人:——
公开号:US4202980A
公开(公告)日:1980-05-13
Studies on tetrahydroisoquinolines. XXI. A synthesis of (.+-.)-1-hydroxy-2-methoxyhomoproaporphine and stereochemistry of 4-oxygenated 1,2,3,4-tetrahydroisoquinolines.
Acid treatment of the p-quinol acetate (23), obtained from the phenolic amine (14) gave (±)-2-hydroxy-3-methoxyhomoproaporphine (20) in excellent yield. However, similar treatment of other p-quinol acetates (24 and 25) afforded no cyclized products. Reaction of 24 or 25 with Ac2O-conc. H2SO4 gave two diastereoisomeric 4, 7-diacetates (36a and 36b or 38a and 38b). The stereostructures of 36a and 36b were decided by nuclear magnetic resonance study, while those of 38a and 38b were determined by chemical transformations and X-ray analyses. The stereoselectivity of acetoxylation is discussed.