Synthetic Studies of Indoles and Related Compounds. XXVII. A New Synthesis of Crenatine from Ethyl Indole-2-carboxylate.
作者:Yasuoki MURAKAMI、Yuusaku YOKOYAMA、Chiyoko AOKI(nee ISHIYAMA)、Hideharu SUZUKI、Katsumi SAKURAI、Tsuneyasu SHINOHARA、Chiemi MIYAGI、Yasuhisa KIMURA、Takefumi TAKAHASHI、Toshiko WATANABE、Taichi OHMOTO
DOI:10.1248/cpb.39.2189
日期:——
Crenatine (1a), which is a member of a new class of β-carboline alkaloids having an oxygen functionality at the 4-position, was synthesized starting from ethyl 1-benzylindole-2-carboxylate (12a) via cyclization of an elaborated C2-subsitituent to the 3-position of the indole nucleus and aluminum chloride-catalyzed debenzylation of the protected indolic nitrogen. 1-Ethyl-4-hydroxy-9-methyl-β-carboline (26b), a positional isomer of crenatine with regard to the methyl group, was also synthesized through the same methodology.
从 1-苄基吲哚-2-羧酸乙酯(12a)开始,通过吲哚核 3 位上精心设计的 C2-副基团的环化和氯化铝催化的受保护吲哚氮的去苄基化,合成了 Crenatine(1a),它是在 4 位上具有氧官能团的一类新的β-咔啉生物碱。同样的方法还合成了 1-乙基-4-羟基-9-甲基-β-咔啉(26b),它是色那汀的甲基位置异构体。