已开发出两种邻位邻苯二甲环的芳香族碳氢键的氧合方案。逆电子需量狄尔斯-阿尔德(IEDDA)反应将酞嗪环转环为萘部分,导致合成了萘[2,1- c ]苯二甲基,1-(邻-羟基芳基)萘和6,7-二氢苯并[ b ]萘并[1,2- d ]奥沙平。这种基于在C–H功能化化学中利用可转化氮杂环的新策略可能潜在地适用于广泛范围的联芳基化合物的合成。
Total Syntheses of Menisporphine and Daurioxoisoporphine C Enabled by Photoredox-Catalyzed Direct C–H Arylation of Isoquinoline with Aryldiazonium Salt
作者:Jing Zhang、Jie Chen、Xiaoyun Zhang、Xiaoguang Lei
DOI:10.1021/jo5020432
日期:2014.11.7
due to their diverse chemical structures as well as remarkable bioactivities. Herein, we report the concise total syntheses of two isoquinoline alkaloids, menisporphine and daurioxoisoporphine C, through a mild and efficient photoredox-catalyzed direct C–H arylation of isoquinoline core with aryldiazonium salt. This new strategy is complementary to the conventional isoquinoline synthesis and would provide
Light as air: A straightforward metal-free four-step one-pot synthetic strategy to access new high-value functionalized phthalazines was developed. Combining a facile light-mediated enolization of o-methyl benzophenones/Diels-Alder reaction domino process with a subsequent deprotection/aromatization domino reaction leads to waste-reducing and cost-effective synthesis of new antiviral model drugs.
C–H functionalization directed by transformable nitrogen heterocycles: synthesis of ortho-oxygenated arylnaphthalenes from arylphthalazines
作者:Shiva K. Rastogi、Derek C. Medellin、Alexander Kornienko
DOI:10.1039/c3ob42255k
日期:——
Two protocols for oxygenation of aromatic C–H bonds ortho-positioned to the phthalazine ring were developed. The transannulation of the phthalazine ring to a naphthalene moiety by an Inverse Electron Demand Diels–Alder (IEDDA) reaction led to the synthesis of naphtho[2,1-c]chromenes, 1-(ortho-hydroxyaryl)naphthalenes and 6,7-dihydrobenzo[b]naphtho[1,2-d]oxepine. This new strategy based on the utilization
已开发出两种邻位邻苯二甲环的芳香族碳氢键的氧合方案。逆电子需量狄尔斯-阿尔德(IEDDA)反应将酞嗪环转环为萘部分,导致合成了萘[2,1- c ]苯二甲基,1-(邻-羟基芳基)萘和6,7-二氢苯并[ b ]萘并[1,2- d ]奥沙平。这种基于在C–H功能化化学中利用可转化氮杂环的新策略可能潜在地适用于广泛范围的联芳基化合物的合成。
Facile synthesis of 1-substituted 4-H phthalazine, a versatile scaffold for chemically diverse phthalazines
An improved synthetic strategy for 1-substituted 4-H phthalazines using a convenient, three-step reaction sequence under mild conditions is described. The protocol involves condensation of hydrazine hydrate with o-ketobenzaldehydes derived through the Pb(OAc)4 oxidation of the N-acylhydrazones of salicylaldehydes. This pathway is of high practical value since a wide variety of substituted acylhydrazides