The present invention relates to a process for the preparation of a compound of formula
wherein R1 is selected from C1-6-alkyl, C3-6-cycloalkyl and aralkyl, and
wherein R2 at each occurrence independently is halogen or C1-6-alkyl, and m is an integer from 0 to 4, Q is selected from halogen, -NO2 and -NR3R4, wherein R3 and R4 are independently selected from hydrogen, C1-6-alkyl, C1-6-cycloalkyl, aryl, aralkyl, mesyl and tosyl, or wherein R3 and R4 together form a C4-6-alkylene group, Y at each occurrence is hydrogen or a hydroxy protection group W that can be hydrolytically cleaved under acidic conditions, and n is an integer from 1 to 3, and n is an integer from 1 to 3, with the proviso that n and m together are not greater than 5.
本发明涉及一种制备化合物的过程,其
化学式为其中R1选自C1-6-烷基,C3-6-环烷基和芳基,R2在每个出现的位置独立地是卤素或C1-6-烷基,m是0到4的整数,Q选自卤素,-
NO2和-NR3R4,其中R3和R4独立地选自氢,C1-6-烷基,C1-6-环烷基,芳基,芳基烷基,
甲烷磺基和对
甲苯磺基,或者R3和R4一起形成一个C4-6-烷基烯基基团,Y在每个出现的位置是氢或可在酸性条件下
水解的羟基保护基W,n是1到3的整数,且n是1到3的整数,但要求n和m的总和不大于5。