Meisenheimer Rearrangement of Azetopyridoindoles. VI. Synthesis of 12-Carbaeudistomin and Related Compounds.
作者:Takushi KURIHARA、Yasuhiko SAKAMOTO、Hiromi MATSUMOTO、Natsuki KAWABATA、Shinya HARUSAWA、Ryuji YONEDA
DOI:10.1248/cpb.42.475
日期:——
N-oxide of the 2-vinylazetopyridoindole 12a bearing a benzenesulfonyl group as a protective group of the indole nitrogen atom afforded the oxazepino ester 14, which was easily isomerized to 20a. Compounds 3 and 4 were synthesized from 14 and 20a, respectively, according to the following reaction sequences [hydrogenation of the double bond (Pd-C/H2), desulfonylation (Mg in MeOH), hydrolysis (AlBr3-EtSH)
为了研究大黄菌素1、12-十二碳半胱氨酸3,其1,10-反式异构体4和11,12-二氢十二碳十二碳半乳糖苷5的结构-活性关系,已进行了合成。带有苯磺酰基作为吲哚氮原子保护基的2-乙烯基吡咯并吲哚吲哚12a的相应N-氧化物的[2,3] -Meisenheimer重排提供了氧杂庚酸酯14,其易于异构化为20a。根据以下反应顺序,分别从14a和20a合成化合物3和4 [双键氢化(Pd-C / H2),脱磺酰化(Mg在MeOH中),水解(AlBr3-EtSH)和Curtius重排(使用NaN3的混合酸酐法),然后进行脱苄基作用(Pd-C / H2)。使用DPPA对羧酸27进行Curtius反应,得到氨基甲酸酯29,