Electrocyclization of β-Arylvinyl Ketenimines: Formal Syntheses of the Alkaloid from Marine Origin, 5,8-Dihydro-7-methoxy-1,6-dimethylisoquinoline-5,8-dione, and 3-Ethoxycarbonylrenierol
作者:Pedro Molina、Angel Vidal、Fulgencio Tovar
DOI:10.1055/s-1997-1277
日期:1997.8
A new six-step synthetic route for the preparation of the alkaloid from marine origin, 5,8-dihydro-7-methoxy-1,6-dimeethylisoquinoline-5,8-dione is reported. The method is based on the electrocyclization of the appropriate β-arylvinyl ketenimine, available by aza Wittig reaction of the corresponding vinyl iminophosphorane with (trimethylsilyl)ethenone followed by decarboxylation and further oxidative demethylation. Likewise, this method has successfully been applied to the preparation of the 3-ethoxycarbonylrenierol.
报道了一种新的六步合成路线,用于制备海洋来源的生物碱 5,8-二氢-7-甲氧基-1,6-二甲基异喹啉-5,8-二酮。该方法基于适当的β-芳基乙烯酮亚胺的电环化,可通过相应的乙烯基亚氨基正膦与(三甲基甲硅烷基)乙烯酮的氮杂维蒂格反应,然后脱羧并进一步氧化脱甲基。同样,该方法已成功应用于3-乙氧基羰基烯醇的制备。