A process for preparing compounds of the formula
where a, b, c, R₁, R₂, and R₃ are as defined herein including the step of alkylating a phenol of formula
with an acetylene of formula
where X is chlorine; bromine; -OC(O)-R₅, where R₅ is alkyl, aryl or substituted aryl; or -OCO₂R₆, where R₆ is alkyl or
in the substituted aryl; or -OCO₂R₆, where R₆ is alkyl or presence of a catalytic amount of a cuprous or cupric salt. The compounds of formula I are intermediates useful in the preparation of pyranyl cyanoguanidine derivatives.
一种制备式化合物的工艺
式中 a、b、c、R₁、R₂ 和 R₃ 如本文所定义,包括将式中的
苯酚烷基化的步骤
与式
其中 X 是
氯;
溴;-OC(O)-R₅,其中 R₅ 是烷基、芳基或取代芳基;或 -OCO₂R₆,其中 R₆ 是烷基或取代烷基。
或 -OCO₂R₆,其中 R₆ 是烷基或存在催化量的亚
铜或
铜盐。式 I 化合物是用于制备
吡喃基
氰基
胍衍
生物的中间体。