Iodine-catalyzed synthesis of fused tetracyclic pyridazino[6,1-b] pyrrolo[1,2-a]quinazolin-9(1H)-one derivatives via a tandem reaction

被引:15
作者
Zhang, Wen-Ting [1 ]
Qiang, Wen-Wen [1 ]
Yao, Chang-Sheng [1 ]
Wang, Xiang-Shan [1 ]
机构
[1] Jiangsu Normal Univ, Sch Chem & Chem Engn, Jiangsu Key Lab Green Synth Funct Mat, Xuzhou 221116, Jiangsu, Peoples R China
关键词
Pyridazinopyrroloquinazoline; 2-Aminobenzohydrazide; Iodine; Tandem reaction; MOLECULAR-IODINE; QUINAZOLIN-4(3H)-ONES; EFFICIENT; QUINOLINES;
D O I
10.1016/j.tet.2016.03.018
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
A facile and general method for the synthesis of pyridazino[6,1-b]pyrrolo[1,2-a]quinazolin-9(1H)-one derivatives via a reaction of 2-aminobenzohydrazide and 1,7-dichloro-heptan-4-one catalyzed by iodine in the presence of excess NaHCO3 is described. This is a tandem reaction to construct three new rings and a chiral quaternary carbon center in one-pot procedure. Two possible pathways in the formation of the second heterocycle are proposed, and they are confirmed by the key intermediates of pyrrolo[1,2-a] quinazolin-5(1H)-ones which are selectively obtained via controlling the ratio of base. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2178 / 2185
页数:8
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