Helmut Vorbrüggen, Konrad Krolikiewicz, "The introduction of nitrile-groups into heterocycles and conversion of carboxylic groups into their corresponding nitriles with chlorosulfonylisocyanate and triethylamine", Tetrahedron, Vol. 50, Issue 22, 1994, 6549-6558.
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http://dx.doi.org/10.1016/S0040-4020(01)89685-X