从(-)-乙酰氧基戊二酰亚胺开始,已通过常见的羟基-内酰胺中间体证明了对-(-)-去乙基乙基氨丁胺,(-)-vindeburnol和(-)-3-epitacamonine的对映选择性多步合成,其总收率很高。(-)-乙酰氧基戊二酰亚胺的乙酰氧基官能团最初被用作诱导对映选择性的手柄,然后被用作酮羰基的潜在来源。最重要的是,已经报道了六氢吲哚并[2,3- a ]喹啉嗪酮的酯醛醇缩合反应中非对映选择性的底物依赖性逆转。
Catalytic asymmetric alkynylation of 3,4-dihydro-β-carbolinium ions was developed for the versatile synthesis of enantiomerically enriched C1-alkynyl tetrahydro-β-carbolines, the utility of which was demonstrated by concise collective total syntheses of the seven indole alkaloids harmicine, geissoschizol, geissoschizine, akuammicine, desethyleburnamonine, eburnamonine, and larutensine within 10 steps