申请人:ELI LILLY AND COMPANY
公开号:EP0112066A1
公开(公告)日:1984-06-27
A stereo-selective preparation of novel sulfonated o-phenylenediamines having a trans-α-alkylidenebenzyl group at the 5-position, which are intermediates in the synthesis of antiviral benzimidazoles, is described. The compounds have the formula
wherein R is methyl or ethyl;
R1 is C3-C5 branched alkyl or NR2R3, wherein R2 and R3 are independently C1-C3 alkyl, or combine with the nitrogen atom to which they are attached to form pyrrolidino, piperidino or morpholino; and are prepared by reacting a benzoyl intermediate of the formula
wherein R1 is defined as above; with a Grignard reagent of the formula
RMgX wherein X is bromo or chloro, and R is defined as above; in an organic solvent suitable for Grignard reactions to form a hydroxy intermediate of the formula
wherein R and R1 are defined as above; and dehydrating the hydroxy intermediate with dilute acid.
本研究描述了一种立体选择性制备新型磺化邻苯二胺的方法,这种磺化邻苯二胺在 5 位上具有反式-α-亚烷基苄基,是合成抗病毒苯并咪唑的中间体。这些化合物的化学式为
其中 R 是甲基或乙基;
R1 是 C3-C5 支链烷基或 NR2R3,其中 R2 和 R3 独立地为 C1-C3 烷基,或与所连接的氮原子结合形成吡咯烷基、哌啶基或吗啉基;并通过反应式为
式中 R1 定义同上;与格氏试剂反应制备。
RMgX,其中 X 为溴代或氯代,R 定义同上;在适合格氏反应的有机溶剂中,生成式为
其中 R 和 R1 定义同上;用稀酸使羟基中间体脱水。