Dihydroisobenzofurans and isoindolines by intramolecular inverse Diels-Alder reactions of pyridines
作者:Marek Biedrzycki、Dick A. de Bie、Henk C. van der Plas
DOI:10.1016/s0040-4020(01)85441-7
日期:1990.1
Pyridines being substituted at position 2 or 3 with a silylated propynyloxymethyl side-chain undergo a thermolytic intramolecular Diels-Alder reaction with formation of dihydroisobenzofurans. The 3-substituted pyridines are found to be more reactive than the 2-substituted ones. Substitution of both hydrogens in the methylene group at the (α-position of this side-chain by one methyl as well as one phenyl
在2或3位被甲硅烷基化的丙氧基氧基甲基侧链取代的吡啶进行热解分子内Diels-Alder反应,形成二氢异苯并呋喃。发现3-取代的吡啶比2-取代的吡啶具有更高的反应性。在该侧链的(α-位)的亚甲基中的两个氢被一个甲基以及一个苯基取代基取代导致反应速率的显着提高。