作者:Thomas R. Walters、Walter W. Zajac、James M. Woods
DOI:10.1021/jo00001a059
日期:1991.1
The utility of the N-haloheterocycles 1-sodio-3,5-dichloro-1,3,5-triazine-2,4,6(1H,3H,5H)-trione (4), 1,3,5-trichloro-1,3,5-triazine-2,4,6(1H,3H,5H)-trione (5), 1,3-dibromo-1,3,5-triazine-2,4,6(1H,3H,5H)-trione (6), and 1,3-dibromo-5,5-dimethylhydantoin (7) for the halogenation-oxidation of oximes to gem-halonitro compounds is reported. The triazine derivatives 4, 5, and 6 provided satisfactory yields when employed either alone or in combination with ozone as a supplemental oxidant. Hydantoin 7 required the use of a supplemental oxidant. The yields for the reactions were consistently 70% for simple oximes and 50% for molecules possessing two oxime functions. Occasional difficulties were encountered in reproducing the yields of the products from the bromination-oxidation sequence. The formation of modest amounts (20-30%) of 3,7-dinitronoradamantane via cyclization was observed in the reactions of bicyclo[3.3.1]nonane-3,7-dione dioxime.