A novel process for the synthesis of chiral hydantoins of the structure ##STR1## wherein X is fluoro or chloro, from the corresponding 6-halo-4-chromanone of the structure ##STR2## is described. The compounds I are valuable in the treatment of certain chronic complications arising from diabetes mellitus. In addition the compound of the formula I wherein X is chloro possesses complementary hypoglycemic activity. The process comprises the sequence of dehydrative coupling of the halochromanone (II) with S-(-)-alpha-methylbenzylamine to form the imine of structure ##STR3## addition of hydrogen cyanide to form the nitrile of structure ##STR4## condensation with chlorosulfonylisocyanate (or its equivalent) to form the alpha-methylbenzylhydantoin of structure ##STR5## and finally solvolysis of the latter to the chiral hydantoin of structure I.
本文介绍了一种新的合成手段,用于从相应的6-卤代-4-
香豆酮(结构式II)合成结构式为##STR1##的手性
咪唑酮。其中X为
氟或
氯。化合物I在治疗由糖尿病引起的某些慢性并发症方面具有重要价值。此外,当X为
氯时,公式I的化合物具有互补的降血糖活性。该过程包括以下步骤:将卤代
香豆酮(II)与S-(-)-α-甲基
苄胺脱
水偶联形成结构式##STR3##的
亚胺,加氢
氰化物形成结构式##STR4##的腈,与
氯磺酰异氰酸酯(或其等效物)缩合形成结构式##STR5##的α-甲基苄基
脲,并最终使其溶剂解离成手性
咪唑酮I。