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。
Solvolysis and ring closure of quinone methides photogenerated from biaryl systems
作者:Yijian Shi、Peter Wan
DOI:10.1139/v05-138
日期:2005.9.1
A variety of biaryl quinone methides have been photogenerated with a range of efficiencies from biaryl precursors 46 and 8, 10, and 11, all having hydroxyl and hydroxymethyl substituents on altern...
Photocyclization of a 1,1′-bisnaphthalene: planarization of a highly twisted biaryl system after excited state ArOH dissociation
作者:Yijian Shi、Peter Wan
DOI:10.1039/a606487f
日期:——
Photolysis of the highly twisted 1,1â²-bisnaphthalene 6 gives the
much more planar dinaphthopyran 10 with high quantum yield (Φ = 0.17)
in aqueous MeCN, demonstrating that the expected enhanced electronic
communication between the connected aromatic rings of biaryls in
S
1
is sufficient to drive thermally unfavourable reactions
requiring initial planarization of these biaryl systems.
Aryl–aryl cross-coupling reactions without reagents or catalysts: photocyclization of <i>ortho</i>-iodoaryl ethers and related compounds <i>via</i> triplet aryl cation intermediates
作者:Wei Sun、Luke Wilding-Steele、Richard C. D. Brown、David C. Harrowven
DOI:10.1039/d3cc03271j
日期:——
Cyclisations of benzyl ortho-iodoaryl ethers to benzo[c]chromenes can be effected without reagents or catalysts by irradiation with UVC under flow. Reactions proceed via triplet aryl cation generation, 5-exo and 3-exo-cyclisations, and rearomatisation. They have wide scope, are easy to effect and extend to a myriad of related ring systems.
苄基邻碘芳基醚环化成苯并[ c ]色烯可以在没有试剂或催化剂的情况下通过在流动下用UVC照射来实现。反应通过三线态芳基阳离子生成、5-外型和3-外型环化以及重新芳构化进行。它们的范围很广,很容易实现并扩展到无数相关的环系统。
Bringmann, Gerhard; Hartung, Thomas; Goebel, Lothar, Liebigs Annalen der Chemie, 1992, # 7, p. 769 - 776
作者:Bringmann, Gerhard、Hartung, Thomas、Goebel, Lothar、Schupp, Olaf、Peters, Karl、Schnering, Hans Georg von