It is to provide a process for synthesizing an intended fluorine-containing compound having a geminal difluoro structure with a high yield, by subjecting a carbonyl compound which is readily available to a two-stage reaction.
A compound (1) such as ethyl 4-oxocyclohexanecarboxylate is reacted with a compound of the formula X-Z or a compound of the formula Z
2
O (wherein Z is a monovalent group which gives a leaving group of the structure —OZ, and X is a chlorine atom, a bromine atom or an iodine atom) such as phosphorus pentachloride, and then a fluorinating agent which generates fluorine anions such as HF is acted thereon to obtain a fluorine-containing compound (2) such as ethyl 4,4-difluorocyclohexanecarboxylate.
1
本发明的目的是提供一种工艺,通过将易于获得的羰基化合物进行两阶段反应,高产率地合成具有双
氟结构的含
氟化合物。
将化合物 (1) 如 4-氧代
环己烷羧酸乙酯与式 X-Z 或式 Z
2
O(其中 Z 为一价基团,可产生结构为 -OZ 的离去基团,X 为
氯原子、
溴原子或
碘原子),如
五氯化磷,然后再与产生
氟阴离子的
氟化剂如 HF 反应,得到含
氟化合物 (2),如
4,4-二氟环己甲酸乙酯。
1