alpha -Aminocyclopentenones are available in a single operation from alpha,beta -unsaturated nitriles and (methoxy)-methoxyallenes. The cyclization is equivalent to an imino Nazarov reaction. (C) 2001 Elsevier Science Ltd. All rights reserved.
The introduction of nitrile-groups into heterocycles and conversion of carboxylic groups into their corresponding nitriles with chlorosulfonylisocyanate and triethylamine
作者:Helmut Vorbrüggen、Konrad Krolikiewicz
DOI:10.1016/s0040-4020(01)89685-x
日期:——
Addition of chlorosulfonylisocyanate (CSI) to heterocycles such as thiophene (4) or indole (15) and unsaturated systems such as dihydropyran (7) gives N-chlorosulfonylamides RCONHSO2Cl, which can be converted by equivalent amounts of triethylamine to their corresponding nitriles. Since carboxylic acids react with CSI to N-chlorosulfonylamides, subsequent treatment with triethylamine affords the corresponding
作者:Marcus A Tius、Chester C Chu、Raquel Nieves-Colberg
DOI:10.1016/s0040-4039(01)00201-5
日期:2001.3
alpha -Aminocyclopentenones are available in a single operation from alpha,beta -unsaturated nitriles and (methoxy)-methoxyallenes. The cyclization is equivalent to an imino Nazarov reaction. (C) 2001 Elsevier Science Ltd. All rights reserved.