A novel palladium-catalyzed decarboxylative cascade cyclization for the assembly of diverse fused heteropolycycles by employing α-oxocarboxylic acids as three-carbon insertion units is reported. This protocol enables the synthesis of isoquinolinedione- and indolo[2,1-a]isoquinolinone-fused benzocycloheptanones in moderate to good yields by the use of different aryl iodides, including alkene-tethered
报道了一种新颖的钯催化脱羧级联环化反应,该反应通过使用α-氧代羧酸作为三碳插入单元来组装各种稠合的杂多环。该方案可通过使用不同的芳基碘化物(包括烯烃系的2-碘代苯甲酰胺和2-(2-碘代苯基)-)以中等到良好的产率合成异喹啉二酮和吲哚并[2,1 - a ]异喹啉酮稠合的苯并环庚酮1 H-吲哚。值得注意的是,该方法通过依次进行分子内碳氢合,CH活化和脱羧,实现了六元环和七元环的同时构建。
Intramolecular Direct C–H Arylation via a Metallocenic Radical Pathway: Stereospecific Approach to Planar-Chiral Ferrocenes
作者:Yang Liu、Jiancong Xu、Jinling Zhang、Xiaohua Xu、Zhong Jin
DOI:10.1021/acs.orglett.7b02995
日期:2017.10.20
Transition metal-free synthesis of planar-chiral 1,2-fused ferrocenes via intramolecular direct C–H bond arylation was achieved. The C–H arylation reactions promoted by a catalytic amount of 1,10-phenanthroline highlighted a unique planar-chiral metallocenic radical intermediate, generated from iodoferrocenes via a single-electron transfer process.
Convenient Synthesis of Benziodazolone: New Reagents for Direct Esterification of Alcohols and Amidation of Amines
作者:Michael T. Shea、Gregory T. Rohde、Yulia A. Vlasenko、Pavel S. Postnikov、Mekhman S. Yusubov、Viktor V. Zhdankin、Akio Saito、Akira Yoshimura
DOI:10.3390/molecules26237355
日期:——
Hypervalent iodine heterocycles represent one of the important classes of hypervalent iodine reagents with many applications in organic synthesis. This paper reports a simple and convenientsynthesis of benziodazolones by the reaction of readily available iodobenzamides with m-chloroperoxybenzoic acid in acetonitrile at room temperature. The structure of one of these new iodine heterocycles was confirmed
高价碘杂环代表了一类重要的高价碘试剂,在有机合成中有许多应用。本文通过容易获得的iodobenzamides与反应报告benziodazolones的简单且方便的合成米氯过氧苯甲酸在室温下,在乙腈中。这些新的碘杂环之一的结构通过 X 射线分析得到证实。与 PPh 3和吡啶结合,这些苯并咪唑酮可以顺利地与醇或胺反应,分别生成相应的 3-氯苯甲酸酯或酰胺。发现在该酯化反应中,新型苯并碘酮试剂比类似的苯并恶酮试剂反应更有效。
Tetrabutylammonium Iodide (TBAI) Catalyzed Electrochemical C–H Bond Activation of 2-Arylated N-Methoxyamides for the Synthesis of Phenanthridinones
作者:Bhalchandra M. Bhanage、Kripa Subramanian、Subhash L. Yedage、Kashish Sethi
DOI:10.1055/a-1467-5585
日期:2021.6
An electrochemical method for the synthesis of phenanthridinones through constant-potential electrolysis (CPE) mediated by Bu4NI (TBAI) is reported. The protocol is metal and oxidant free, and proceeds with 100% current efficiency. TBAI plays a dual role as both a redox catalyst and a supporting electrolyte. The intramolecular C–H activation proceeds under mild reaction conditions and with a short
Copper-Catalyzed C(sp<sup>3</sup>)–S Bond and C(sp<sup>2</sup>)–S Bond Cross-Coupling of 2-(2-Iodobenzoyl) Substituted or 2-(2-Iodobenzyl) Substituted 1,2,3,4-Tetrahydroisoquinolines with Potassium Sulfide: Synthesis of Isoquinoline-Fused 1,3-Benzothiazine Scaffolds
作者:Pan Dang、Zhilei Zheng、Yun Liang
DOI:10.1021/acs.joc.6b02943
日期:2017.2.17
efficient and simple strategy to construct the corresponding benzothiazinederivatives via formation of C(sp3)–S bond and C(sp2)–S bond, which the C–S bonds formed via different routes in this reaction (traditional cross-coupling reaction via the cleavage of C–I bond and oxidative cross-coupling reaction via C(sp3)–H bond functionalization).