Studies in sigmatropic rearrangement: synthesis of 4-aryloxy-methylene-1,7-dimethyl-1,2,3-trihydropyridino-[3,2-c]pyran-5-ones
作者:K.C Majumdar、S Ghosh
DOI:10.1016/s0040-4020(00)01118-2
日期:2001.2
A number of 4-[N-4′-aryloxy but-2-ynyl N-methyl amino-6-methyl pyran-2-ones (4a–g) have been prepared in excellent yields from N-(1-aryloxy-but-2-ynyl)-N-methyl amine (3) and 4-tosyloxy-6-methyl-pyran-2-one (2). Thermal rearrangement of compounds 4(a–g) gave 4-aryloxy-methyl-1,7-dimethyl-1,2-dihydropyridino-[3,2-c] pyran-5-ones (6) and/or 4-aryloxymethylene-1,7-dimethyl-1,2,3-trihydropyridino-[3,2-c]
从N-(1-芳氧基-丁酸酯)制备了许多4- [ N -4'-芳氧基丁-2-炔基N-甲基氨基-6-甲基吡喃-2-酮(4a–g) -2-炔基)-N-甲胺(3)和4-甲苯磺酰氧基-6-甲基-吡喃-2-酮(2)。化合物4(a–g)的热重排得到4-芳氧基-甲基-1,7-二甲基-1,2-二氢吡啶基-[3,2 - c ]吡喃-5-酮(6)和/或4-芳氧基亚甲基-1,7-二甲基-1,2,3-三氢吡啶基-[3,2- c ]吡喃-5-酮(5)。