Provided is an industrially applicable process for producing 1,2-cis-2-fluorocyclopropane-1-carboxylic ester.
A process for producing a compound represented by formula (3):
[wherein R
1
represents, for example, a C1-C8 alkyl group], which process includes reacting a compound represented by formula (1):
[wherein X
1
represents a hydrogen atom, a chlorine atom, a bromine atom, or an iodine atom; X
2
represents a hydrogen atom, a chlorine atom, a bromine atom, or an iodine atom; X
1
and X
2
are not simultaneously hydrogen atoms; and R
1
has the same meaning as defined in formula (3)] with a reducing agent represented by formula (2):
M
1
BH
m
R
2
n
(
2
-
1
)
or
M
2
(BH
m
R
2
n)
2
(
2
-
2
)
[wherein M
1
represents an alkali metal atom; M
2
represents an alkaline earth metal atom or a zinc atom; R
2
represents, for example, a hydrogen atom; m represents an integer from 1 to 4; n represents an integer from 0 to 3; and the sum of m and n is 4] in the presence of an aprotic polar solvent, and a Lewis acid such as a halide of an atom selected from among, for example, boron, magnesium, and aluminum.
提供了一种工业上适用的制备1,2-顺式-2-
氟环丙烷-1-
羧酸酯的方法。该方法包括将化合物1与还原剂2在非质子极性溶剂和卤素原子(如
硼、
镁和铝)的卤化物等
路易斯酸的存在下反应,制备化合物3(其中R1代表C1-C8烷基)。化合物1的结构式为:其中X1和X2分别代表氢原子、
氯原子、
溴原子或
碘原子;X1和X2不能同时为氢原子;R1的含义与式3中定义的相同。还原剂2的结构式为:M1BHmR2n(2-1)或M2(BHmR2n)2(2-2);其中M1代表碱
金属原子;M2代表碱土
金属原子或
锌原子;R2代表氢原子等;m为1至4的整数;n为0至3的整数;m和n的和为4。