开发了一种新的有效协议,可以通过钯催化的顺序偶联/环化反应直接合成chromeno [3,4- b ] pyrrol-4(3 H)-one衍生物。关键策略依赖于通过钯催化相关炔属氨基香豆素的分子内加氢胺化来形成吡咯环。通过四步法方便地合成多环lamellarin支架,已证明了所获得的chromeno [3,4- b ]吡咯-4(3 H)-产物的合成效用。它为合成潜在有价值的lamellarin类似物提供了新的机会。
开发了一种新的有效协议,可以通过钯催化的顺序偶联/环化反应直接合成chromeno [3,4- b ] pyrrol-4(3 H)-one衍生物。关键策略依赖于通过钯催化相关炔属氨基香豆素的分子内加氢胺化来形成吡咯环。通过四步法方便地合成多环lamellarin支架,已证明了所获得的chromeno [3,4- b ]吡咯-4(3 H)-产物的合成效用。它为合成潜在有价值的lamellarin类似物提供了新的机会。
Synthesis of lactone-fused pyrroles by ruthenium-catalyzed 1,2-carbon migration-cycloisomerization
作者:Takuma Watanabe、Yuichiro Mutoh、Shinichi Saito
DOI:10.1039/c9ob02363a
日期:——
A ruthenium-catalyzed cycloisomerization of 3-amino-4-alkynyl-2H-chromen-2-ones via 1,2-carbon migration was developed. Various 1-arylchromeno[3,4-b]pyrrol-4(3H)-ones were synthesized in good to excellent yields. The reaction was applied to the formal total synthesis of marine natural products Ningalin B and Lamellarin H. The efficient synthesis of γ-butyrolactone-fused pyrrole derivatives was also
通过1,2-碳迁移,开发了钌催化的3-氨基-4-炔基-2 H-铬原子-2-酮的环异构化反应。合成了各种1-芳基色[3,4- b ]吡咯-4(3 H)-,收率良好。该反应用于海洋天然产物宁格林B和Lamellarin H的正式全合成。还实现了γ-丁内酯融合的吡咯衍生物的有效合成。
Ruthenium-Catalyzed Cycloisomerization of 2-Alkynylanilides: Synthesis of 3-Substituted Indoles by 1,2-Carbon Migration
作者:Takuma Watanabe、Yuichiro Mutoh、Shinichi Saito
DOI:10.1021/jacs.7b04564
日期:2017.6.14
We developed ruthenium-catalyzedcycloisomerization of alkynylanilides that gave 3-substituted indoles in high yields. The reaction proceeded via the disubstituted vinylidene ruthenium complex that was formed by the 1,2-carbon migration.
Iron/Palladium-Catalyzed Intramolecular Hydroamination: An Expedient Synthesis of Pyrrole-Annulated Coumarin and Quinolone Derivatives
作者:K. Majumdar、Nirupam De、B. Roy
DOI:10.1055/s-0030-1258311
日期:2010.12
A highly efficient intramolecular hydroamination reaction of heterocycle-centered aminoalkynes using both substituted and free amines catalyzed by PdCl2/FeCl3 catalytic system to form the biologically important pyrrolocoumarin and pyrroloquinolone derivatives is reported. The use of both aliphatic and aromatic substituted alkynes with different heterocyclic skleton in this strategy demonstrated the