Intramolecular Ene Reactions. Stereo- and Enantioselective Synthesis of Spirolactams through Thermolysis of Enamino Carboxamides
作者:Janine Cossy、Abdelrrahim Bouzide、Michel Pfau
DOI:10.1021/jo970257o
日期:1997.10.1
thermal rearrangement of tertiary and secondary enamino carboxamides has been developed. The enamine group of an enamino carboxamide, in which no electron-withdrawing group is present in the enophile, can be involved in the ene reaction and the enamino carboxamide can be transformed into enamino or imino spirolactams. In the case of secondary carboxamido enamines, the diastereoselectivity is higher than 98%
基于叔和仲烯氨基羧酰胺的热重排,已经开发了一种新的,容易获得螺内酰胺的方法。烯反应中不存在吸电子基的烯氨基羧酰胺的烯胺基可以参与烯反应,并且烯氨基羧酰胺可以转化为烯氨基或亚氨基螺内酰胺。在仲羧酰胺烯胺的情况下,非对映选择性高于98%。如果使用手性非外消旋类似物,则最终产物中对映体过量可达到50-54%。