Brønsted Acid Catalyzed Selective Cyclization Reaction: An Efficient and Facile Synthesis of Polysubstituted Imidazole and Pyrrole Derivatives
作者:Liangce Rong、Lei Dai、Ping Shu、Zhansheng Wang、Qingyang Li、Qiuyu Yu、Yanhui Shi
DOI:10.1055/s-0036-1588605
日期:——
five-membered heterocyclic compounds and the results also show that p-toluenesulfonic acid monohydrate (PTSA·H2O) is an effective catalyst for this synthesis. Therefore, the advantages of this approach are excellent yields, short reaction times, operational simplicity, and good regioselectivity. An efficient and facile synthesis of 3-(5-aryl-1,3-dimethyl-2-oxo-2,3-dihydro-1H-imidazol-4-yl)indolin-2-one and
摘要 3-(5-芳基-1,3-二甲基-2-氧代-2,3-二氢-1 H-咪唑-4-基)吲哚-2--2-和3-(2,5 -diaryl -3-氧代-1,2,3,6-四氢吡咯并[2,3- c ^ ]吡唑-4-基)二氢吲哚-2-酮衍生物是从选择性环化反应报道3-(2-芳基-在布朗斯台德酸条件下,2-氧代亚乙基)吲哚-2-酮和1,3-二甲基脲或5-氨基-2-苯基-2,4-二氢-3 H-吡唑-3-酮。尽管底物中有两个羰基,但从靛红中选出的羰基是专门用于环化反应以得到目标产物的。报道的产物是新的五元杂环化合物,结果还表明对甲苯磺酸一水合物(PTSA·H 2O)是该合成的有效催化剂。因此,这种方法的优点是优异的收率,较短的反应时间,操作简单和良好的区域选择性。 3-(5-芳基-1,3-二甲基-2-氧代-2,3-二氢-1 H-咪唑-4-基)吲哚-2--2-和3-(2,5 -diaryl -3-氧代-1,2,3