The invention discloses a simple synthesis process of an
anxiolytic drug lorazepam intermediate. The simple synthesis process comprises the steps of putting N-(2-chloroethyl)
acetamide,
triethylamine and
dichloromethane into a reaction
bottle; stirring the mixture in an
ice water bath; dropwise adding an o-nitrobenzyl
chloride DCM (
Dichloromethane) solution to the
ice water bath; removing the
ice water bath; separating the liquid; extracting the liquid with
dichloromethane, and combining organic phases;
drying the combined organic phase; concentrating the organic phase to
dryness under reducedpressure to obtain a compound (1); putting the compound (1),
acetic acid and
ethanol into the reaction
bottle for stirring; adding
iron powder to the mixture to perform a temperature rise reaction; extracting the mixture twice with
toluene, and combining the organic phases;
drying the combined organic phase; filtering the organic phase; and collecting a filtrate to obtain a
toluene solution of a compound (2); stirring the
toluene solution of the compound (2) and
potassium iodide, preserving heat until the raw materials are completely reacted; extracting an aqueous phase once with toluene, andcombining the organic phases;
drying the combined organic phase; filtering the organic phase; collecting a filtrate; concentrating the filtrate to
dryness under reduced pressure; adding methyl tert-butyl
ether, refluxing and pulping, cooling and separating the material; and filtering the material to obtain a final product. The yield of the two steps is 84.2% and the purity is 99%. According to thesimple synthesis process of the
anxiolytic drug lorazepam intermediate disclosed by the invention, the raw materials are simple and easy to obtain, the operation is simple and convenient, the yield is high, the three wastes are less, and the synthesis process is suitable for industrial production.