Regioselective 4-amino-de-chlorination of trichloro- and dichloro-pyrimidines with N-sodium carbamates
作者:Dario Montebugnoli、Pierfrancesco Bravo、Eleonora Corradi、Giovanna Dettori、Charles Mioskowski、Alessandro Volonterio、Alain Wagner、Matteo Zanda
DOI:10.1016/s0040-4020(02)00084-4
日期:2002.3
4-N-Alkoxycarbonylamino-2,6-dichloro- and -2-chloro-pyrimidines have been synthesized in good to excellent regioselectivity and yields from N-sodium carbamates and, respectively, 2,4,6-trichloropyrimidine and 2,4-dichloropyrimidine, in DNIF, rt, 15-30 min. The reaction is effective also with 4,6-dichloropyrimidine, producing 4-N-alkoxycarbonylamino-6-chloropyrimidines in good yields. Some conformational features of 4-N-alkoxycarbonylamino-2,6-dichloro-pyrimidines have been investigated by X-ray diffraction and H-1 NMR spectroscopy. (C) 2002 Published by Elsevier Science Ltd.