Аннотация:Condensing MeCOCH2R (R = H, Me, Pr) with O2NCNa(CHO)2 (I) in 25-30% aq. R1NHR2 (R1 = Me, Et, Bu, R2 = H; R1 = R2 = Me) at room temp. gave 6 2,4-R(O2N)C6H3NR1R2 in 7-30% yield. 4-O2NC6H4NHMe was also prepd. in 14% yield from I and (MeCO)2CH2 in aq. MeNH2. A mechanism for these cyclizations is given.