Facile Synthesis of Oxa- and Azacyclic Dienes via Cycloalkenation of Alkynyltungsten Compounds. Stereoselective Construction of Tricyclic Furan and Pyran Derivatives via Intramolecular Diels−Alder Reaction
作者:Wen-Tai Li、Min-Hui Pan、Yi-Ru Wu、Sue-Lein Wang、Fen-Lin Liao、Rai-Shung Liu
DOI:10.1021/jo000044q
日期:2000.6.1
action of anhydrous Me(3)NO in CH(3)CN. This method is applicable to the synthesis of a number of oxa- and azacyclic dienes, including those tethered with an electron-deficient olefin. The oxacyclic 1,3,8-nonatrienes and 1,3,9-decatrienes undergo intramolecularDiels-Alderreactions upon heating in toluene, yielding tricyclic tetrahydropyran and -furan derivatives with excellent diastereoselectivities