Process for producing 1,3-dithiol-2-ylidene malonates
申请人:NIHON NOHYAKU CO., LTD.
公开号:EP0062118A1
公开(公告)日:1982-10-13
Preparation of a 1,3-dithiol-2-ylidene malonic-acid dialkyl ester for use as an agricultural or horticultural fungicide and as a therapeutic agent for treating hepatic diseases by a process comprising reacting a dialkyloxycarbonylketene dimercaptide with a trihalogenethane in the presence of a base, according to the formula:
in which
M = alkali metal or ammonium
Y= halogen
Z=halogen or hydrogen
R and R'= lower alkyl.
2-(1,3-Dithiol-2-ylidene)-2-[N-(substituted) carbamoly] acetate esters and salts thereof, having good therapeutic or prophylactic effect for hepatic disorder; are provided. Processes for their preparation and intermediates in their preparation also are disclosed.