申请人:Alfa Wassermann S.p.A.
公开号:US05097058A1
公开(公告)日:1992-03-17
New process for the synthesis of the .alpha.-(1-m.ethylethyl)-3,4-dimethoxyacetonitrile of formula (I): ##STR1## which is known as an intermediate in the synthesis of the drug internationally known as verapamil. The process starts from the isobutyryl-3,4-dimethoxybenzene of formula (II): ##STR2## which, by means of the Darzens condensation, gives an epoxyester which, by alkaline hydrolysis and subsequent decarboxylation, gives the .alpha.-(1-methylethyl)-3,4-dimethoxybenzeneacetaldehyde. This product is reacted with hydroxylamine to obtain the corresponding oxime that, by dehydration, gives the nitrile of formula I.
一种合成α-(1-甲基乙基)-3,4-二甲氧基乙腈的新工艺,其化学式为(I):##STR1##,该化合物在国际上被认为是合成药物维拉帕米的一种中间体。该工艺从化学式为(II)的异丁酰基-3,4-二甲氧基苯开始:##STR2##,通过Darzens缩合反应,生成一种环氧酯,再经碱性水解和随后的脱羧反应,得到α-(1-甲基乙基)-3,4-二甲氧基苯乙醛。该产物与羟胺反应,得到相应的肟,再通过脱水反应,最终得到化学式为I的腈。