Type 2 Intramolecular Nitroso Diels−Alder Reaction. Synthesis and Structure of Bridgehead Oxazinolactams
作者:Steven M. Sparks、Jesse D. Vargas、Kenneth J. Shea
DOI:10.1021/ol005811m
日期:2000.5.1
[reaction--see text] The type 2 intramolecular Diels-Alder cycloaddition utilizing N-acylnitroso dienophiles provides an efficient entry into bridged oxazinolactams. In contrast to the bimolecular counterpart, the reaction is completely regioselective. Structural characterization of the cycloadducts allows for evaluation of the olefin distortion and the degree of pyramidalization of the bridgehead
[反应-见正文]利用N-酰基亚硝基二烯亲和体的2型分子内Diels-Alder环加成反应可有效地连接桥接的恶嗪内酰胺。与双分子对应物相比,该反应是完全区域选择性的。环加合物的结构表征可以评估烯烃的畸变和桥头恶嗪基内酰胺的锥体化程度。