Visible-Light-Induced Regioselective C(sp3)-H Acyloxylation of Aryl-2H-azirines with (Diacetoxy)iodobenzene
摘要:
A visible-light-promoted regioselective coupling of C(sp(3))-H of aryl-2H-azirine and (diacetoxy)-iodobenzene has been reported. Rose Bengal as an organo-photoredox catalyst has been used in this reaction. The reaction proceeds under aerobic condition at room temperature. A variety of aryl-2H-azirines gives the corresponding acyloxylated azirines under this reaction conditions. The reaction goes through a radical pathway. The protocol is also applicable on gram-scale synthesis.
Self-Catalyzed Rapid Synthesis of <i>N</i>-Acylated/<i>N</i>-Formylated α-Aminoketones and <i>N</i>-Hydroxymethylated Formamides from 3-Aryl-2<i>H</i>-Azirines and 2-Me/Ph-3-Aryl-2<i>H</i>-Azirines
作者:Aramita De、Sougata Santra、Grigory V. Zyryanov、Adinath Majee
DOI:10.1021/acs.orglett.0c01206
日期:2020.5.15
by the reaction of 3-aryl-2H-azirines and highly substituted 2-Me/Ph-3-aryl-2H-azirines with various carboxylic acids under ambient air within 10 min at room temperature. N-Trifluoroacetylated α-aminoketones with different substituents have been reported in the presence of trifluoroacetic acid. This protocol is equally effective to synthesize N-formylated α-aminoketone and N-hydroxymethylated formamide
Synthesis of Unsymmetrical Pyrazines Based on α-Diazo Oxime Ethers
作者:Nicole S. Y. Loy、Sunggak Kim、Cheol-Min Park
DOI:10.1021/ol5034173
日期:2015.2.6
Synthesis of unsymmetrically substituted pyrazines has been a challenge. The reactivity of α-imino carbenoids derived from α-diazo oxime ethers has been exploited for pyrazinesynthesis, in which the reaction of α-diazo oxime ethers with 2H-azirines provides highly substituted pyrazines in good to excellent yields.
Selective C–C bond formation from rhodium-catalyzed C–H activation reaction of 2-arylpyridines with 3-aryl-2<i>H</i>-azirines
作者:Yonghyeon Baek、Jinwoo Kim、Hyunseok Kim Hyunseok Kim、Seung Jin Jung、Ho Ryu、Suyeon Kim、Jeong-Yu Son、Kyusik Um、Sang Hoon Han、Hyung Jin Seo、Juyoung Heo、Kooyeon Lee、Mu-Hyun Baik、Phil Ho Lee
DOI:10.1039/c8sc05142a
日期:——
coupling. Computational studies quickly revealed and prototype experimental work confirmed that neither the formation of the expected metal nitrene complexes nor the C–N coupling were viable. Instead, azirine ring-opening followed by C–C coupling was found to be much more favorable to give imines that readily underwent hydrolysis in aqueous conditions to form acylmethyl-substituted products. This new method
Cu/Ag-Catalyzed Reaction of Azirines with Anthranils: Synthesis of (Quinazolin-2-yl)methanone Derivatives
作者:Yajun Sun、Huimin Sun、Ying Wang、Fang Xie
DOI:10.1021/acs.orglett.0c02222
日期:2020.9.4
to expedite syntheses of (quinazolin2-yl)methanone derivatives. The transformation represents an unprecedented approach which employs a copper catalysis to cleave both a N–C2 azirine bond and N–O anthranil bond. Subsequently, an unexplored 1,3-hydroxyl migration and β-N elimination are likely the key to access (quinazolin-2-yl)methanone derivatives.
Cu / Ag催化3-芳基2 H-叠氮基与蒽的环化反应已加快了(quinazolin2-yl)methanone衍生物的合成。该转变代表了一种空前的方法,该方法采用铜催化来裂解N–C 2叠氮键和N–O蒽键。随后,未经探索的1,3-羟基迁移和β-N消除可能是获得(喹唑啉-2-基)甲酮衍生物的关键。
Cascade Reaction of 2-Naphthols and Azirines: One-Pot Synthesis of C-3 Naphthol-Substituted Benzo[<i>e</i>]indoles
A copper-catalyzed annulation of 3-aryl-2H-azirines with 2-naphthols has been developed for the rapid assembly of C-3-naphthol-substituted benzo[e]indoles in one pot. This cascade reaction was realized through dearomatic nucleophilic ring opening of azirine, intramolecularcyclization, and oxidative cross-dehydrogenative coupling to furnish the important unreported π-expanded naphthol/benzo[e]indole
已开发出铜催化的 3-芳基-2 H-氮杂环与 2-萘酚环化,用于在一个锅中快速组装 C-3-萘酚取代的苯并 [ e ] 吲哚。这种级联反应是通过氮丙啶的脱芳亲核开环、分子内环化和氧化交叉脱氢偶联来实现的,以提供重要的未报道的 π 扩展萘酚/苯并 [ e ] 吲哚联芳基化合物。