Process for the preparation of 5-methoxy-4-(methylthioalkyl) 1, 3-bis(phenylmethyl)-2-imidazolidone
申请人:Council of Scientific and Industrial Research
公开号:US06350881B1
公开(公告)日:2002-02-26
This invention provides a process for the preparation of 5-methoxy-4-(methylthioalkyl)-1,3-bis(phenylmethyl)-2-imidazolidone having general formula (2a-d)
[wherein R═—CH2COCH2CH2CH2COOMe (2a); —CH2CH(OMe)2(2b); —CH2COOMe(2c); —H (2d)] which comprises reacting a reducing agent with 6-benzyl-7-methoxy-3-phenylperhydroimidazo[1,5-c][1.3]thiozol-5-one in the presence of an organic solvent for a period ranging from 0.5 to 2 hrs at a temperature ranging from −78° C. to 80° C., evaporating the solvent and reacting the residue with an alkylating reagent, optionally in the presence of a phase transfer catalyst and an inorganic base in an organic solvent for a period ranging from 10-12 hrs at room temperature, evaporating the solvent followed by purification to obtain the desired compound of general formula 2 a-d.
这项发明提供了一种用于制备5-甲氧基-4-(甲硫代烷基)-1,3-双(苯甲基)-2-咪唑烷酮的过程,其通用式为(2a-d) [其中R为—CH2COCH2CH2CH2COOMe (2a); —CH2CH(OMe)2(2b); —CH2COOMe(2c); —H (2d)],包括在有机溶剂中,在温度范围为-78°C至80°C的条件下,将还原剂与6-苄基-7-甲氧基-3-苯基过氢咪唑并[1,5-c][1.3]噻唑-5-酮反应,反应时间为0.5至2小时,蒸发溶剂,然后将残渣与烷基化试剂反应,可选地在有机溶剂中,在室温条件下,与相转移催化剂和无机碱反应10-12小时,蒸发溶剂后经过纯化得到通用式2a-d的目标化合物。