+++thanks_Commander L_1 article from Sciencedirect

[pendyala123]

Ring opening and closing reactions of imidazoles and other 1,3-diazaheterocycles with vinyl chloroformate and phenyl chloroformate Original Research Article
Tetrahedron Letters, Volume 22, Issue 26, 1981, Pages 2431-2434
R.F. Pratt, K.K. Kraus

DOI:

http://dx.doi.org/10.1016/S0040-4039(01)92925-9

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http://www.sciencedirect.com/science/article/pii/S0040403901929259