[EN] PREPARATION OF CHIRAL 1,2,3,4-TETRAHYDRO-6,7-DIALKOXY-3-ISOQUINOLINECARBOXYLIC ACID AND DERIVATIVES BY REACTING LEVODOPA WITH FORMALDEHYDE OR FORMALDEHYDE PRECURSORS<br/>[FR] PREPARATION D'ACIDE CHIRAL 1,2,3,4-TETRAHYDRO-6,7-DIALCOXY-3-ISOQUINOLINECARBOXYLIQUE ET DE SES DERIVES PAR LA REACTION DE LEVODOPA ET DE PRECURSEURS DE FORMALDEHYDE OU DE FORMALDEHYDE
申请人:BRANTFORD CHEM INC
公开号:WO2003101967A1
公开(公告)日:2003-12-11
A process for preparation of (S)-1,2,3,4-tetrahydro-6,7-dialkoxy-3-isoquinolinecarboxylic acid compounds and their derivatives of the formula (1) the process compring: (i) reacting Levodopa of formula (2) with formaldehyde or formaldehyde precursors to obtain (S)-1,2,3,4-tetrahydro-6,7-dihydroxy-3-isoquinolinecarboxylic acid of formula (3); (ii) protecting the amino group of formula (3); (iii) alkylating the phenol groups of formula (4) to form compound of formula (5); and (iv) esterifying the carcoxylic acid of formula (5) and optionally removing N-protecting group 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; R3 is hydrogen, C2-C12 acyl group, benzyl, alkoxylcarbonyl group, or aralkoxyl carbonyl group; wherein P is the protecting group selected from alkoxycarbonyl, acyl, alkyl, aryl, siryl, sulfenyl and sulfonyl.
一种制备(S)-1,2,3,4-四氢-6,7-二烷氧基-3-异喹啉羧酸化合物及其衍生物的方法,其化合物的结构式为(1),该方法包括:(i)将结构式(2)的左旋多巴与甲醛或甲醛前体反应,得到结构式(3)的(S)-1,2,3,4-四氢-6,7-二羟基-3-异喹啉羧酸;(ii)保护结构式(3)的氨基团;(iii)烷基化结构式(4)的酚基,形成结构式(5)的化合物;以及(iv)酯化结构式(5)的羧基,并可选择去除N-保护基,其中R1为氢、较低烷基、C2-C12酰基,或R1O共同为亚甲二氧基;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;R3为氢、C2-C12酰基、苄基、烷氧羰基基团,或芳基烷氧羰基基团;其中P为从烷氧羰基、酰基、烷基、芳基、硫酰基和磺酰基中选择的保护基。