Reaction of 1-methyl-2-[methylthio(trimethylsilylmethylimino)methylimino]-1, 2-dihydropyridine (1), prepared from 2-amino-1-methyl-pyridinium iodide in 3 steps, with carbonyl compounds in the presence of 2 eq of cesium fluoride in acetonitrile afforded 2-(1-methyl-1, 2-dihydropyridylidene)aminooxazoline derivatives (12), which correspond to formal [3+2] cycloadducts of the aminonitrile ylid. Further, compound 1 reacted with carbonyl compounds in the presence of a catalytic amount of tetra-n-butylammonium fluoride (TBAF) to give corresponding cycloadducts.
                                    由2-
氨基-1-甲基-
碘化
吡啶鎓分3步制备得到的1-甲基-2-[甲
硫基(三甲基甲
硅烷基甲基亚
氨基)甲基亚
氨基]-1, 2-
二氢吡啶(1)与羰基化合物在2当量存在下反应
氟化铯在
乙腈中的反应得到2-(1-甲基-1,2-
二氢吡啶基)
氨基
恶唑啉衍
生物(12),其对应于
氨基腈内鎓的形式[3+2]环加合物。此外,化合物1在催化量的四正丁基
氟化铵(TBAF)存在下与羰基化合物反应,得到相应的环加合物。