A divergent approach to benzylisoquinoline-type and oxoaporphine alkaloids via regioselective direct ring metalation of alkoxy isoquinolines
作者:Benedikt Melzer、Franz Bracher
DOI:10.1039/c5ob00926j
日期:——
ols as building blocks for divergent syntheses of different types of benzylisoquinoline alkaloids. Photochemical cyclization of ortho-bromo analogues under reductive conditions gives oxoaporphinealkaloids. Nine benzylisoquinoline alkaloids and two oxoaporphinealkaloids were obtained in two or three steps from appropriate isoquinolines.
Aromatization of 1-Benzyltetrahydroisoquinolines: Racemization of (?)-(S)-(N-nor)-Reticuline
作者:Peter Buchs、Arnold Brossi
DOI:10.1002/hlca.19810640310
日期:1981.4.29
Aromatization in the series of opticallyactive 1-benzyltetrahydroisoquinolines has been accomplished with (—)-(S)−(N-nor)-reticuline (1b) and analogs. Direct catalytic or chemical reduction of the isoquinoline 4 obtained could not be achieved in a practical way but 4 was converted into 1 in three steps (4 8 9 1), in 55% overall yield. Partial O-methylation of the isoquinoline 4 gave the isoquinoline alkaloid