Ambident reactivity of nitro heteroaromatic anions
作者:Takashi Murashima、Ryuji Tamai、Ken-ichi Fujita、Hidemitsu Uno、Noboru Ono
DOI:10.1016/0040-4039(96)01918-1
日期:1996.11
Two classes of nitroheteroaromatic compounds such as quinoxalines 7a,b and 7c,d with ethyl isocyanoacetate in the presence of 1,8-diazabicyclo[5,4,0]undec-7-ene g gave the corresponding pyrimidine N-oxides 8a-d, whilst, in contrast, use of proazaphosphatrane 2 or iminophosphorane 4 as a base under similar conditions gave the corresponding pyrroles 9a-d.