A novel synthesis of (±)-harmacine and (±)1,2,3,4,6,7,12,12b-octahydroindole[2,3-a]quinolizine
作者:Frank D. King
DOI:10.1002/jhet.5570440634
日期:2007.11
A three-step synthesis of (±)-harmacine is described from the readily available 4,4-diethoxybutan-1-amine via an acid-mediated acyl iminium ion cyclisation. The synthesis of the homologous (±)1,2,3,4,6,7,12,12b-octahydroindole[2,3-a]quinolizine from 5,5-diethoxypentan-1-amine is also described. Although similar, the two systems required very different cyclisation conditions.
从容易获得的4,4-二乙氧基丁烷-1-胺经酸介导的酰基亚胺离子环化反应,描述了(±)-甜菜碱的三步合成法。还描述了由5,5-二乙氧基戊丹-1-胺合成同源的(±)1,2,3,4,6,7,12,12b-八氢吲哚[2,3- a ]喹诺嗪。尽管相似,但这两个系统需要非常不同的环化条件。
Efficient Syntheses of Crispine A and Harmicine by Rh-Catalyzed Cyclohydrocarbonylation
作者:Wen-Hua Chiou、Gau-Hong Lin、Che-Cheng Hsu、Stephen J. Chaterpaul、Iwao Ojima
DOI:10.1021/ol900702t
日期:2009.6.18
The first examples of Rh-catalyzed cyclohydrocarbonylation-bicyclization of N-allylic amides of arylacetic acids are reported. This novel carbonylative bicyclization process was successfully applied to the rapid syntheses of crispine A and its analogues (tricyclic indolizidine alkaloids) as well as harmicine (tetracyclic beta-carboline alkaloid).