Nitroimidazoles, Part 1. An Unexpected Reactivity During the Cyclization of 3‐(4‐Amino‐1‐benzyl‐2‐ethyl‐1<i>H</i>‐imidazol‐5‐ylsulphanyl)‐propionic Acid Methyl Ester
作者:Yaseen A. Al‐Soud、Najim A. Al‐Masoudi
DOI:10.1080/00397910500184735
日期:2005.9.1
Abstract Nucleophilic substitution of the 5‐bromo group in 1 by methyl 3‐mercaptopropionate gave the 5‐alkyl‐mercapto derivative 2. Reduction of 2 with H2/Pd led to the amine 3, meanwhile reduction with Fe/HOAc afforded the 5‐acetamido derivative 4 and not the cyclized derivative 1,3,8‐triaza‐azulen‐7‐one 6, as expected. Treatment of 3 with NaOMe/MeOH furnished the racemic mixture 5a and 5b via an unexpected
摘要 1 中的 5-溴基被 3-巯基丙酸甲酯亲核取代得到 5-烷基-巯基衍生物 2。2 用 H2/Pd 还原得到胺 3,同时用 Fe/HOAc 还原得到 5-乙酰氨基正如预期的那样,衍生物 4 而不是环化衍生物 1,3,8-triaza-azulen-7-one 6。用 NaOMe/MeOH 处理 3 通过意想不到的反应性提供外消旋混合物 5a 和 5b。