Synthesis of 1,3-dihydrofuro[3,4-]pyridines and 5,7-dihydrofuro[3,4-]pyridines by intramolecular Diels-Alder reactions of pyrimidines. Investigation of the effect of steric interactions on the reaction rate
作者:A.E. Frissen、A.T.M. Marcelis、D.G. Buurman、C.A.M. Pollmann、H.C. van der Plas
DOI:10.1016/s0040-4020(01)89505-3
日期:1989.1
5-propynyloxymethylpyrimidines were synthesized and their intramolecular Diels-Alder reaction was studied. The products of the reaction were 5,7-dihydrofuro[3,4-]pyridines and 1,3-dihydrofuro[3,4-]pyridines, respectively. Introduction of one or two alkyl (aryl) groups at the α or γ position of the side-chain of the 5-propynyloxymethylpyrimidines results in an increased reaction rate. This phenomenon is discussed in terms
合成了几种2-和5-丙炔氧基甲基嘧啶,并研究了它们的分子内Diels-Alder反应。反应产物分别为5,7-二氢呋喃[3,4- ]吡啶和1,3-二氢呋喃[3,4- ]吡啶。在5-丙炔基氧基甲基嘧啶的侧链的α或γ位置上引入一个或两个烷基(芳基)导致反应速率增加。根据相对旋转木马的数量讨论了这种现象。炔基或嘧啶环上的取代会延迟环加成反应的速度。