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 intramolecularDiels-Alderreaction 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