Aromatization and chemoselective alkylation of 1-methyl-3,4-dihydro-β-carboline-3-carboxylic acid and its derivatives
作者:Keyur G. Brahmbhatt、Nafees Ahmed、Inder P. Singh、Kamlesh K. Bhutani
DOI:10.1016/j.tetlet.2009.07.075
日期:2009.9
N-alkylation reactions of 1-methyl-3,4-dihydro-β-carboline-3-carboxylic acid methyl ester, giving rise to 9-alkyl-1-methyl-β-carboline-3-carboxylic acid methyl esters. Inverse addition of base during a similar reaction resulted in a chemoselective alkylation to form novel 3-butyl-1-methyl-3,4-dihydro-β-carboline-3-carboxylic acid methyl ester as the major product in good yield.
在1-甲基-3,4-二氢-β-咔啉-3-羧酸甲酯的N-烷基化反应中观察到前所未有的芳香化反应,生成9-烷基-1-甲基-β-咔啉-3-羧酸甲酯。在相似的反应过程中,碱的反向添加导致化学选择性的烷基化反应,以高收率形成了以3-丁基-1-甲基-3,4-二氢-β-咔啉-3-羧酸甲酯为主要产物的新型化学反应。