Concise Syntheses of Dictyodendrins A and F by a Sequential C–H Functionalization Strategy
摘要:
Syntheses of dictyodendrins A and F have been achieved using a sequential C-H functionalization strategy. The N-alkylpyrrole core is fully functionalized by means of a rhodium(I)-catalyzed C-H arylation at the C3-position, a rhodium(II)-catalyzed double C-H insertion at the C2- and C5-positions, and a Suzuki-Miyaura cross-coupling reaction at the C4-position. The syntheses of dictyodendrins A and F were completed by formal 6p-electrocyclization to generate the pyrrolo[2,3-c]carbazole core of the natural products.
A Unified Modular Synthetic Strategy for Dictyodendrins F, H, I, and G
作者:Sreenivas Banne、D. Prabhakar Reddy、Wenxi Li、Chenhui Wang、Jian Guo、Yun He
DOI:10.1021/acs.orglett.7b02511
日期:2017.9.15
the first total synthesis of dictyodendrins G and synthesis of dictyodendrin F, H and I in 11 steps. The synthesis features consecutive functionalization of the core aminoquinone by palladium-mediated Suzuki–Miyaura coupling reaction, 1,4-addition, acylation and base mediated formation of a pyrrolinone, and the formation of carbazolequinone moiety through a formal [3 + 2] cycloaddition using arynes generated
A Concise Total Synthesis of Dictyodendrins F, H, and I Using Aryl Ynol Ethers as Key Building Blocks
作者:Wenhan Zhang、Joseph M. Ready
DOI:10.1021/jacs.6b06460
日期:2016.8.24
We report a concise total synthesis of dictyodendrin F and the first total syntheses of dictyodendrins H and I in six steps. In these syntheses, aryl ynol ethers were employed as the key building blocks to introduce aryl and heteroaryl rings in the dictyodendrins. This rapid synthesis utilized a novel hetero-[2 + 2]-cycloaddition reaction between two aryl ynol ethers to yield a cyclobutenone ring.
我们分六个步骤报告了 dictyodendrin F 的简明全合成和 dictyodendrins H 和 I 的首次全合成。在这些合成中,芳基炔醇醚被用作在 dictyodendrins 中引入芳基和杂芳基环的关键结构单元。这种快速合成利用两个芳基炔醇醚之间的新型杂-[2 + 2]-环加成反应生成环丁烯酮环。环丁烯酮通过逆 4π/6π-电环化-N-酰化级联反应依次转化为高度取代的咔唑,以提供 dictyodendrin 核心。连续的分子内氧化偶联和脱保护得到 dictyodendrins F、H 和 I。
In total and formal syntheses of dictyodendrins B, C, E, and F, the key step involved the direct construction of the pyrrolo[2,3‐c]carbazole core by the gold‐catalyzed annulation of a conjugated diyne with a pyrrole to form three bonds and two aromatic rings. The subsequent introduction of substituents at the C1 (Suzuki–Miyaura coupling), C2 (addition to an aldehyde), N3 (alkylation), and C5 positions
在双脱硫木糖醇B,C,E和F的全部和形式合成中,关键步骤涉及通过金催化的共轭二炔与吡咯的环化反应直接构建吡咯并[2,3- c ]咔唑核三个键和两个芳香环。随后在C1(Suzuki-Miyaura偶联),C2(加成醛),N3(烷基化)和C5位置(乌尔曼偶联)处引入取代基提供了不同的途径获得十碳五苯醚。
Total Synthesis of Dictyodendrins A–F by the Gold‐Catalyzed Cascade Cyclization of Conjugated Diyne with Pyrrole
The total synthesis of dictyodendrins A–F was achieved by using the gold(I)‐catalyzed annulation of a conjugated diyne with N‐Boc‐pyrrole for direct construction of the pyrrolo[2,3‐c]carbazole scaffold. Late‐stage functionalization of the resulting pyrrolo[2,3‐c]carbazole to introduce various substituents provided divergent access to dictyodendrins. Some dictyodendrin analogues exhibited inhibitory
dictyodendrins A-F的总合成是通过金(I)催化的共轭二炔与N -Boc-吡咯的环化反应直接构建吡咯并[2,3- c ]咔唑支架而实现的。所得吡咯并[2,3– c ]咔唑的后期官能化引入各种取代基提供了对十二碳四烯联苯醚的不同途径。一些双齿豆蔻甙类似物对CDK2 / CycA2和GSK3表现出抑制活性。