A process for the preparation of a compound of formula (1):
1
in which R
1
is an alkyl, arylalkyl, allyl, alkyloxycarbonyl, arylalkyloxycarbonyl, acyl or alkynyl group; and R
2
is substituted phenyl, especially 3,4-methylenedioxyphenyl; and X is hydrogen or a readily removable group, such as chlorine, bromine or iodine.
一种制备式(1)化合物的方法:其中R1是烷基,芳基烷基,烯丙基,烷氧羰基,芳基烷氧羰基,酰基或炔基;R2是取代苯基,特别是3,4-亚甲二氧基苯基;X是氢或易于去除的基团,例如
氯,
溴或
碘。