Synthesis of the Reported Protoberberine Gusanlung D
摘要:
分别从均哌酰基胺或苯乙胺与均苯二甲酸酐或 3,4-亚甲二氧基均苯二甲酸开始,通过相应均苯二甲酰亚胺的回归选择性还原脱水,然后通过分子内酸催化或自由基环化途径,轻松合成了所报道的 (±)-gusanlung D 和 (±)-isogusanlung D 结构。从相应的正交卤代均苯二甲酰亚胺开始,通过选择性还原脱水,然后以分子内 Heck 偶联反应为关键步骤,完成了脱氢古生隆和脱氢异古生隆 D 的合成。所有四种合成化合物的分析和光谱数据都与天然草珊瑚龙 D 的报告数据不同,因此需要对天然产物的结构分配进行修订。
Synthesis of the Reported Protoberberine Gusanlung D
摘要:
分别从均哌酰基胺或苯乙胺与均苯二甲酸酐或 3,4-亚甲二氧基均苯二甲酸开始,通过相应均苯二甲酰亚胺的回归选择性还原脱水,然后通过分子内酸催化或自由基环化途径,轻松合成了所报道的 (±)-gusanlung D 和 (±)-isogusanlung D 结构。从相应的正交卤代均苯二甲酰亚胺开始,通过选择性还原脱水,然后以分子内 Heck 偶联反应为关键步骤,完成了脱氢古生隆和脱氢异古生隆 D 的合成。所有四种合成化合物的分析和光谱数据都与天然草珊瑚龙 D 的报告数据不同,因此需要对天然产物的结构分配进行修订。
Facile air-oxidation of N-homopiperonyl-5,6-dimethoxyhomophthalimide: simple and efficient access to nuevamine
作者:Prasad B. Wakchaure、Srinivasan Easwar、Vedavati G. Puranik、Narshinha P. Argade
DOI:10.1016/j.tet.2007.11.104
日期:2008.2
six-step synthesis of naturally occurring (±)-nuevamine with 55% overall yield has been described, starting from methyl 2-(6-formyl-2,3-dimethoxyphenyl)acetate via the quantitative benzylic air-oxidation of the corresponding N-homopiperonyl-5,6-dimethoxyhomophthalimide to N-homopiperonyl-5,6-dimethoxyisoquinoline-1,3,4-trione as the key reaction, followed by base catalyzed regioselective alcoholysis of the
Starting from homopiperonylamine or phenethylamine with homophthalic anhydride or 3,4-methylenedioxyhomophthalic acid, respectively, facile syntheses of the reported structures of (±)-gusanlung D and (±)-isogusanlung D were accomplished via regioselective reductive dehydration of the corresponding homophthalimides followed by an intramolecular acid-catalyzed or radical cyclization pathway. Starting from the corresponding suitably ortho-halogenated homophthalimides, the syntheses of dehydrogusanlung and dehydroisogusanlung D were completed via regioselective reductive dehydration followed by an intramolecular Heck coupling reaction as the key steps. The analytical and spectral data obtained for all four synthetic compounds differed from the reported data for natural gusanlung D, and therefore the structural assignment of the natural product needs to be revised.
分别从均哌酰基胺或苯乙胺与均苯二甲酸酐或 3,4-亚甲二氧基均苯二甲酸开始,通过相应均苯二甲酰亚胺的回归选择性还原脱水,然后通过分子内酸催化或自由基环化途径,轻松合成了所报道的 (±)-gusanlung D 和 (±)-isogusanlung D 结构。从相应的正交卤代均苯二甲酰亚胺开始,通过选择性还原脱水,然后以分子内 Heck 偶联反应为关键步骤,完成了脱氢古生隆和脱氢异古生隆 D 的合成。所有四种合成化合物的分析和光谱数据都与天然草珊瑚龙 D 的报告数据不同,因此需要对天然产物的结构分配进行修订。