A Novel Synthesis of Chiral 1-Allyl-1,2,3,4-tetrahydro-β-carboline Employing Allyltributyltin and Chiral Acyl Chlorides
作者:Takashi Itoh、Yûji Matsuya、Yasuko Enomoto、Kazuhiro Nagata、Michiko Miyazaki、Akio Ohsawa
DOI:10.1055/s-1999-2952
日期:1999.11
β-Carboline was acylated at its 9-position by a chiral acyl chloride, followed by reaction with allyltributyltin and 2,2,2-trichloroethyl chloroformate to afford an 1-allyl-1,2-dihydrocarboline derivative in a diasteroselective manner. The chiral acyl group at N-9 was readily eliminated by aqueous alkali to give carboxylic acid quantitatively without racemization on C-1 position. The formed 1-allyl-1,2-dihydro-β-carboline was transformed to 1-allyl-1,2,3,4-tetrahydro-β-carboline.
β-咔啉在其9-位被手性酰氯酰化,然后与烯丙基三丁基锡和2,2,2-三氯乙基氯甲酸酯反应以非对映选择性方式提供1-烯丙基-1,2-二氢咔啉衍生物。 N-9位上的手性酰基很容易被碱水溶液消除,定量地得到羧酸,而C-1位上没有外消旋化。形成的1-烯丙基-1,2-二氢-β-咔啉转化为1-烯丙基-1,2,3,4-四氢-β-咔啉。