Reaction of Allenyl Esters with Sodium Azide: An Efficient Synthesis of E-Vinyl Azides and Polysubstituted Pyrroles
Xian Huang,* Ruwei Shen and Tiexin Zhang
*Department of Chemistry, Zhejiang University (Xixi Campus), Hangzhou 310028, P. R. China, Email: huangxmail.hz.zj.cn
X. Huang, R. Shen, T. Zhang, J. Org. Chem., 2007, 72, 1534-1537.
The nucleophilic addition of sodium azide to 1,2-allenyl esters regio- and stereoselectively generates vinyl azides in excellent yields. A sequential reaction for the synthesis of pyrroles using 1-allyllic 1,2-allenyl esters as substrates is developed on the basis of a domino process involving nucleophilic addition, 1,3-dipolar cycloaddition, denitrogenation, and aromatization.
see article for more examples