Photoaddition reactions of pyrroles (2-4) and indoles (5-8) to N-methyl-2-pyridone (1) have been investigated. The reaction occurred primarily by way of addition of the C2-H bond of the pyrrole ring and the C3-H bond of the indole ring to the pyridone nucleus, yielding 4-substituted 3, 4-dihydro-1-methylpyridin-2(1H)-ones (9 from pyrrole; 13 and 17 from indoles) and 6-substituted 3, 6-dihydro-1-methylpyridin-2(1H)-ones (10 from pyrrole; 14 and 18 from indoles). The presence of a methyl group(s) at the reactive site(s) of pyrrole and indole resulted in the formation of the products arising from the addition of the C3-H bond of the pyrrole ring, and the N1-H, C2-H and C6-H bonds of the indole ring. N-Methylpyrrole (4) and N-methylindole (8) did not give any detectable amount of the addition product.
                                    对
吡咯(2-4)和
吲哚(5-8)与N-甲基-2-
吡啶酮(1)的光加成反应进行了研究。反应主要通过
吡咯环的C2-H键和
吲哚环的C3-H键与
吡啶酮核的加成反应进行,生成4-取代的3, 4-二氢-1-
甲基吡啶-2(1H)-酮(来自
吡咯的9;来自
吲哚的13和17)以及6-取代的3, 6-二氢-1-
甲基吡啶-2(1H)-酮(来自
吡咯的10;来自
吲哚的14和18)。在
吡咯和
吲哚的反应位点存在甲基取代基时,导致了由
吡咯环的C3-H键以及
吲哚环的N1-H、C2-H和C6-H键的加成反应所生成的产物。
N-甲基吡咯(4)和N-甲基
吲哚(8)未能产生任何可检测量的加成产物。