描述了一种通过α-酮乙烯基叠氮化物和2-氨基吡啶的有效无催化剂环合反应合成咪唑并[1,2- a ]吡啶的新策略。从容易获得的乙烯基叠氮化物和2-氨基吡啶合成了几种咪唑并[1,2- a ]吡啶,并通过简单地蒸发反应溶剂以高纯度形式获得。这种极高的产率和原子经济的方案允许通过级联反应和重排形成三个新的C–N键。
coupled with 1/2-naphthols or 2-hydroxy-1,4-naphthoquinone using Ru(bpy)3(PF6)2 as a photocatalyst under blue LED light irradiation to yield 2,3-fused pyrroles in high yields (68–84%). The overall transformation involves photosensitized decomposition of α-azidochalcones into highly reactive 2H-azirines which are trapped by 1/2-naphthols or 2-hydroxy-1,4-naphthoquinone, leading to the construction of
A facile approach to polysubstituted pyrazoles from hydrazonyl chlorides and vinyl azides
作者:Hongbin Zou、Huajian Zhu、Jiaan Shao、Jianwei Wu、Wenteng Chen、Marc A. Giulianotti、Yongping Yu
DOI:10.1016/j.tet.2011.04.103
日期:2011.7
A novel and facile approach to polysubstituted pyrazoles from readily synthesized hydrazonyl chlorides and vinyl azides was developed. The reaction was regiospecific and proceeded under mild conditions in the presence of base. (C) 2011 Elsevier Ltd. All rights reserved.
Domino Approach for the Synthesis of Pyrrolo[1,2-α]pyrazine from Vinyl Azides
A domino synthesis of pyrrolo[1,2-alpha]pyrazine from 1H-2-pyrrolecarbaldehyde and readily synthesized vinyl azides was developed. This reaction proceeded under relatively mild conditions in the presence of base. Additionally, a possible mechanism for the entire sequence is proposed.
Synthesis of polysubstituted 5-aminopyrimidine-2(1H)-thiones from vinyl azides and thiourea
A simple, straightforward, and efficient method for the synthesis of polysubstituted 5-aminopyrimidine-2(1H)-thiones from vinyl azides and thiourea was developed. This reaction proceeded under relatively mild conditions and need no additional additives. Additionally, a possible mechanism for the entire sequence is proposed. (C) 2012 Elsevier Ltd. All rights reserved.