Formation and Reaction of o-Quinol Acetates of N-Acyl- and N-Methanesulfonyl-1,2,3,4-tetrahydro-6-methoxyisoquinolin-7-ols
作者:Osamu Hoshino、Masaji Suzuki、Hiromichi Ogasawara
DOI:10.3987/com-99-s84
日期:——
Oxidation of N-formyl-, N-acetyl-, N-ethoxycarbonyl-, and N-methanesulfonyl-1,2,3,4-tetrahydro-6-methoxyisoquinolin-7-ols (1b-e) with lead tetraacetate in dichloromethane (CH2Cl2) produced quantitatively corresponding o-quinol acetates (2b-e), treatment of which with trifluoroacetic acid in CH2Cl2 at 0 degrees C for a few minutes afforded corresponding N-acyl- and N-methanesulfonyl-wilsonirines (4b-e) and N-acyl- and N-methanesulfonylnorsebiferines (5b-e). When the reaction was carried out at room temperature, o-quinol acetates (2d,e) of N-ethoxycarbonyl and N-methanesulfonyl congeners (Id,e) gave 1-[2(ethoxycarbonylamino)ethyl]- and 1-[2-(methanesulfonylamino)ethyl]-4-hydroxy-3,6,7-trimethoxyphenanthrenes (8d,e).