Tandem Cleavage of Hydrogenatedβ- andγ-Carbolines− New Practical Synthesis of Tetrahydroazocino[4,5-b]indoles and Tetrahydroazocino[5,4-b]indoles Showing Acetylcholinesterase Inhibitory Activity
作者:Leonid G. Voskressensky、Tatiana N. Borisova、Larisa N. Kulikova、Alexej V. Varlamov、Marco Catto、Cosimo Altomare、Angelo Carotti
DOI:10.1002/ejoc.200400107
日期:2004.7
γ-carbolines underwent tandem piperidine ring cleavage on treatment with dimethyl acetylenedicarboxylate (DMAD) or ethyl propiolate (EP) in the presence of alcohols, producing 3-alkoxymethyl-substituted indoles in high yields. These compounds were cyclized to tetrahydroazocino[4,5-b]indoles in the presence of AlCl3. Hydrogenated β-carbolines produced tetrahydroazocino[5,4-b]indoles directly upon treatment
在醇存在下,用乙炔二甲酸二甲酯 (DMAD) 或丙炔酸乙酯 (EP) 处理氢化 γ-咔啉发生串联哌啶环裂解,以高产率生产 3-烷氧基甲基取代的吲哚。这些化合物在 AlCl3 存在下环化为四氢偶氮基 [4,5-b] 吲哚。氢化 β-咔啉在乙醇中用 EP 处理后直接产生四氢偶氮基 [5,4-b] 吲哚。对得到的偶氮吲哚衍生物进行了体外乙酰胆碱酯酶 (AChE) 抑制活性的初步评估。发现它们中的大多数抑制 AChE,IC50 值在微摩尔范围内,化合物 17 最有效(IC50 = 8.7 μM)。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)