Synthesis of Bridged Benzoazabicyclic Compounds Using Radical Translocation/Cyclization Reactions of 1-Alkynyl-2-(o-iodobenzoyl)tetrahydroisoquinolines
摘要:
Bu3SnH-mediated radical translocation/cyclization reactions of 1-alkynyl-2-(o-iodobenzoyl)tetrahydroisoquinolines were examined. The 1-[3-(trimethylsilyl)prop-2-ynyl]- (10a) and 1-[4-(trimethylsilyl)but-3-ynyl]-1,2,3,4-tetrahydroisoquinoline derivatives (10b), with Bu3SnH in the presence of azobis(isobutyronitrile) in boiling toluene, gave regioselectively the 6,7,8,9-tetrahydro-5H-benzocyclohepten-5,8-imine (12a) and 5,6,7,8,9,10-hexahydrobenzocycloocten-5,9-imine (12b), respectively.
presented that gives direct access to 1,1-disubstitutedtetrahydroisoquinolines. The reaction is a titanium(III)-catalyzed reductive umpolung process in which nitriles act as effective acylation agents. The method is highly chemo- and regioselective and is demonstrated in 20 examples. It is well-suited for the large-scale synthesis of functionalized tetrahydroisoquinoline products, which is exemplified in
Development of an Efficient Synthesis of <i>rac</i>
-3-Demethoxyerythratidinone via a Titanium(III) Catalyzed Imine-Nitrile Coupling
作者:Hieu-Trinh Luu、Jan Streuff
DOI:10.1002/ejoc.201801479
日期:2019.1.10
The development of an efficient synthesis of the erythrinaalkaloid 3‐demethoxyerythratidinone is described. A titanium(III) catalyzed umpolung in form of an imine–nitrile coupling reaction serves as key step for the construction of the highlighted C–C bond.
Concise Synthesis of the<i>Erythrina</i>Alkaloid 3-Demethoxyerythratidinone via Combined Rhodium Catalysis
作者:Jung Min Joo、Ramoncito A. David、Yu Yuan、Chulbom Lee
DOI:10.1021/ol102535u
日期:2010.12.17
The total synthesis of the erythrinaalkaloid 3-demethoxyerythratidinone has been achieved via a strategy based on combined rhodium catalysis. The catalytic tandem cyclization effected by the interplay of alkynyl and vinylidene rhodium species allows for efficient access to the A and B rings of the tetracyclic erythrinane skeleton in a single step. The synthesis also features rapid preparation of the
通过基于联合铑催化的策略,已经实现了赤藓类生物碱 3-脱甲氧基赤藓酮酮的全合成。由炔基和亚乙烯基铑物种相互作用实现的催化串联环化允许在一个步骤中有效地进入四环赤藓烷骨架的 A 和 B 环。该合成还具有快速制备双环闭合所需前体的特点,因此仅在 7 个总步骤中完成,总产率为 41%。
Synthesis and structure–activity relationship of disubstituted benzamides as a novel class of antimalarial agents
作者:Katsuhiko Mitachi、Yandira G. Salinas、Michele Connelly、Nicholas Jensen、Taotao Ling、Fatima Rivas
DOI:10.1016/j.bmcl.2012.05.124
日期:2012.7
identified a novel series of disubstituted benzamide compounds with significant activity against malaria strains 3D7 and K1. These compounds represent a new antimalarial molecular scaffold exemplified by compound 1, which demonstrated EC50 values of 60 and 430 nM against strains 3D7 and K1, respectively. Herein we report our findings on the efficient synthesis, structure–activityrelationships, and biological