Preparation of chiral 1,2,3,4-tetrahydro-6,7-dialkoxy-3-isoquinolinecarboxylic acid and derivatives
申请人:Brantford Chemicals Inc.
公开号:US06642384B1
公开(公告)日:2003-11-04
The present invention relates to a process for the production of (S)-1,2,3,4-tetrahydro-6,7-dialkoxy-3-isoquinolinecarboxylic acid compounds (1) and their derivatives from Levodopa (L-Dopa). The ultimately prepared compounds are used as intermediates for, but not limited to, the preparation of substituted derivatives of 1,2,3,4-tetrahydro-6,7-dialkoxy-3-isoquinolinecarboxylic acid
wherein
R1 is hydrogen, lower alkyl, C2-C12 acyl, or R1O together are methylenedioxy;
R2 is hydrogen, alkyl, substituted alkyl, alkenyl, substituted alkenyl, aryl, substituted aryl, aralkyl or substituted aralkyl group; and
R3 is hydrogen, C2-C12 acyl group, benzyl, alkoxylcarbonyl group, or aralkoxyl carbonyl group.
本发明涉及一种从左旋多巴(L-Dopa)制备(S)-1,2,3,4-四氢-6,7-二烷氧基-3-异喹啉羧酸化合物(1)及其衍生物的过程。最终制备的化合物可用作1,2,3,4-四氢-6,7-二烷氧基-3-异喹啉羧酸的取代衍生物的中间体,但不限于此。
其中
R1为氢、较低烷基、C2-C12酰基,或R1O一起为亚甲二氧基;
R2为氢、烷基、取代烷基、烯基、取代烯基、芳基、取代芳基、芳基烷基或取代芳基烷基;以及
R3为氢、C2-C12酰基、苄基、烷氧羰基基团,或芳基烷氧羰基基团。