Facile Synthesis of [1,2,3]-Triazole-Fused Isoindolines, Tetrahydroisoquinolines, Benzoazepines and Benzoazocines by Palladium-Copper Catalysed Heterocyclisation
摘要:
An elegant method for the synthesis of 1,2,3-triazoles fused with five-, six-, seven- and eight-membered benzoheterocycles, including isoindoline, tetrahydroisoquinoline, benzoazepine and benzoazocine, has been developed via palladium-copper catalysed reactions in one-pot. The broad scope of this reaction was illustrated by effecting bis-heteroannulations, synthesis of uracil derivatives of biological interest, and employment of acetylene gas as an inexpensive substrate. The reactions are experimentally simple and utilise easily accessible substrates of different types.
Facile Synthesis of [1,2,3]-Triazole-Fused Isoindolines, Tetrahydroisoquinolines, Benzoazepines and Benzoazocines by Palladium-Copper Catalysed Heterocyclisation
摘要:
An elegant method for the synthesis of 1,2,3-triazoles fused with five-, six-, seven- and eight-membered benzoheterocycles, including isoindoline, tetrahydroisoquinoline, benzoazepine and benzoazocine, has been developed via palladium-copper catalysed reactions in one-pot. The broad scope of this reaction was illustrated by effecting bis-heteroannulations, synthesis of uracil derivatives of biological interest, and employment of acetylene gas as an inexpensive substrate. The reactions are experimentally simple and utilise easily accessible substrates of different types.
Total Synthesis of (±)-Cephanolides B and C via a Palladium-Catalyzed Cascade Cyclization and Late-Stage sp<sup>3</sup> C–H Bond Oxidation
作者:Lun Xu、Chao Wang、Ziwei Gao、Yu-Ming Zhao
DOI:10.1021/jacs.8b03015
日期:2018.4.25
we report the first totalsyntheses of complex cephalotaxus diterpenoids cephanolide B and C from commercially available 5-bromo-2-methylanisole. Key to the success of this synthetic route is a palladium-catalyzed cascade cyclization reaction, which allowed us to efficiently forge the 6-5-6 cis-fused tricyclic ring systems found in the entire family of cephalotaxus diterpenoids. Additionally, site-selective
在此,我们报告了从市售的 5-溴-2-甲基苯甲醚中首次全合成复杂头杉二萜类头孢内酯 B 和 C。该合成路线成功的关键是钯催化的级联环化反应,这使我们能够有效地构建在整个头杉二萜类化合物中发现的 6-5-6 顺式稠合三环系统。此外,位点选择性后期 sp3 CH 键氧化是头孢内酯 C 化学合成中的关键战略要素。
Generation of Medium-Ring Cycloalkynes by Ring Expansion of Vinylogous Acyl Triflates
作者:Jumreang Tummatorn、Gregory B. Dudley
DOI:10.1021/ol2003308
日期:2011.3.18
Reductive cyclization of aryl and vinyl iodides tethered to vinylogous acyl trifiates (VATS) induces a ring-expanding fragmentation to provide cyclic alkynyl ketones, including strained nine-membered cycloalkynes, in fair to excellent yield. The tandem cyclization/C-C bond-cleavage is Initiated under carefully optimized conditions by halogen metal exchange in the presence of carbonyl and vinyl triflate functionality. A modified protocol for alkylation of 1,3-cyclohexanedione is described for preparing the relevant VAT substrates.
Process and intermediates for preparing compounds having a disubstituted acetylene moiety and retinoic acid-like biological activity