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Аннотация:Treatment of 5-nitro-2-methylpyridine, prepd. in 62% yield by reaction of CH2(CO2Et)2 and 2-chloro-5-nitropyridine, with BrCH2COR (R = Me, Ph, CMe3) gave 28-78% pyridinium salts I, which were cyclized to give 31-93% 6-nitroindolizines II. Reaction of 3-nitro-2-methylpyridine with PhCOCH2Br gave the resp. phenacylpyridinium deriv. which was cyclized to 86% III (R = Ph). III (R = Me) was prepd. in 36% yield by treatment of 2-methyl-3-nitropyridine with MeCOCH2Br, followed by cyclization. No 7-nitroindolizine deriv. was detected in the reaction mixt. of 2-methyl-4-nitropyridine with BrCH2COPh.