Synthesis of oxazole and furan derivatives <i>via</i> Rh<sub>2</sub>(OAc)<sub>4</sub>-catalyzed C≡X bond insertion of cyclic 2-diazo-1,3-diketones with nitriles and arylacetylenes
作者:Chenli Fan、Xinwei He、Yin Zuo、Yongjia Shang
DOI:10.1080/00397911.2018.1473441
日期:2018.11.2
Abstract A convenient and efficient procedure for the synthesis of 2-substituted-6,7-dihydrobenzo[d]oxazol-4(5H)-ones and 2-aryl-6,7-dihydrobenzofuran-4(5H)-ones through a Rh2(OAc)4-catalyzed C≡X (X = N, C) insertion of cyclic 2-diazo-1,3-diketones with nitriles and aromatic alkynes has been developed. This reaction uses readily available starting materials and stable cyclic 2-diazo-1,3-diketone compounds
摘要 一种通过 Rh2 合成 2-取代-6,7-二氢苯并[d]恶唑-4(5H)-酮和2-芳基-6,7-二氢苯并呋喃-4(5H)-酮的简便有效方法(OAc)4 催化的 C≡X (X = N, C) 插入环状 2-重氮-1,3-二酮与腈和芳香炔已被开发。该反应使用容易获得的起始材料和稳定的环状 2-重氮-1,3-二酮化合物,以良好至高产率形成所需产物。提出了涉及该反应的 C≡X 键插入和 1,5-偶极电环化/开环和环化序列的初步机制。图形概要
Cu(II)-catalyzed synthesis of 2,4,5-trisubstituted oxazoles
for the synthesis of 2,4,5-trisubstituted oxazoles has been developed from the direct coupling of α-diazoketones with aryl or alkyl nitriles. The reaction proceeds through the formation of nitrilium ion by the nucleophic addition of nitrile onto diazo functionality followed by an intramolecular trapping of nitrilium ion by keto group. Both aryl, and alkyl nitriles underwent smooth cyclocondensation
Rhodium(II)-catalyzed Cycloaddition of Cyclic Diazodicarbonyl Compounds with Nitriles. Synthesis of Tetrahydrobenzoxazoles, Tetrahydrobenzofurans, and Tetrahydrobenzodioxoles
作者:Yong Rok Lee、Jung Yup Suk
DOI:10.3987/com-97-7881
日期:——
The chemistry of photolytically and thermally generated α-ketocarbenes from iodonium ylides of β-diketones
作者:Lazaros P. Hadjiarapoglou
DOI:10.1016/s0040-4039(00)96535-3
日期:1987.1
[3+2]-Cycloaddition reactions of 2-phenyliodonio-5,5-dimethyl-1,3-dioxacyclohexanemethylide
作者:Efstathios P Gogonas、Lazaros P Hadjiarapoglou
DOI:10.1016/s0040-4039(00)01672-5
日期:2000.11
Iodonium ylide 2, derived from dimedone, undergoes thermal [3+2]-cycloaddition with acetylenes and nitriles with Rh-2(OAc)(4) to form the corresponding furans and oxazoles, respectively. Photochemically 2 reacts with various alkenes to form E-dihydrofuran derivatives. (C) 2000 Elsevier Science Ltd. All rights reserved.