Tricyclic-isoxazolidine analogues via intramolecular 1,3-dipolar cycloaddition reactions of nitrones
作者:Simon Saubern、James M. Macdonald、John H. Ryan、Ruth C.J. Woodgate、Theola S. Louie、Matthew J. Fuchter、Jonathan M. White、Andrew B. Holmes
DOI:10.1016/j.tet.2010.01.062
日期:2010.4
tetrahydroisoxazolepyranopyridines were prepared by an intramolecular 1,3-dipolar cycloaddition reaction of a nitrone with an alkene. For N-alkylated hexahydroisoxazolequinolines, reduction of the reaction time from two days to 40 min was achieved using microwave heating. The cyclization to form tetrahydroisoxazolepyranopyridines only proceeded when the alkene was substituted with an electron withdrawing group.
三环-异恶唑烷类似物四氢噻吩并异恶唑,六氢异恶唑基喹啉和四氢异恶唑吡喃并吡啶是通过硝酮与烯烃的分子内1,3-偶极环加成反应制备的。对于N-烷基化的六氢异恶唑基喹啉,使用微波加热将反应时间从两天减少到40分钟。仅当烯烃被吸电子基团取代时,才进行形成四氢异恶唑吡喃并吡啶的环化反应。