β-Carboline alkaloids 9 [1]. Total synthesis of the β-carboline alkaloids arenarine A and (±)arenarine B
作者:Franz Bracher、Andreas Puzik
DOI:10.1002/jhet.5570410206
日期:2004.3
The first total synthesis of the β-carboline alkaloids arenarine A (1) and arenarine B (2) is described. Methanolysis of the α-bromoketone 9 gives 1 in good yield. Alternatively 1 can be obtained from the diazoketone 11 with boron trifluoride/methanol in poor yield. Reduction of 1 with sodium borohydride gives racemic arenarine B (2). Regioselective homolytic methylation of norharmane (4) with tert-butyl
描述了β-咔啉生物碱芳烃A (1)和芳烃B (2)的第一个全合成。α-溴代酮9的甲醇分解得到1的高收率。可替代地1,可以从得到的重氮酮11用三氟化硼/甲醇产率较差。用硼氢化钠还原1可获得外消旋芳烃B (2)。用叔丁基氢过氧化物/硫酸亚铁对正畸烷(4)进行区域选择性均化甲基化,得到生物碱harmane (6)。