Boron azides in Staudinger oxidations and cycloadditions
作者:Rebecca L. Melen、Alan J. Lough、Douglas W. Stephan
DOI:10.1039/c3dt50791b
日期:——
and a cycloaddition reaction has taken place. However, if the Staudinger reaction is prohibited via phosphine oxidation as in the case of (EtO)2P(O)CCP(O)(OEt)2 then the unusual dimeric product 4 [2-(C6F5)2B-4-(P(O)OEt2)-2H-1,2,3-triazole-5-P(O)(OEt)(OB(C6F5)2)] is generated. The structures of 1b–d, 2b–d, 3 and 4 have been determined by X-ray diffraction.
Cy 2 BN 3与三取代膦的斯托丁格反应(R 3 P)产生了硼-氮-磷连接系统Cy 2 BN PR 3(分别为Et,t Bu,Cy,Ph)(分别为1a-1d)。类似地,(C 6 F 5)2 BN 3与膦P t Bu 3,PPh 3,Ph 2 PC CPh和Ph 2 PC CPPh 2的反应产生(C 6 F 5)2 BNPR 3(分别为2a–d)。相反,(C反应6 ˚F 5)2 BN 3的Ph 2 P-Ç Ç p -tol在过量的Me存在3的SiN 3,得到双环产物3 [1-(C 6 ˚F 5)2乙-4-(对甲苯基)-1 H -1,2,3-三唑-5-P(NH)Ph 2 ],其中施陶丁格和环加成反应均已发生。但是,如果史陶丁格反应是通过以下方式禁止的(EtO)2 P(O)C CP(O)(OEt)2的情况下进行膦氧化,然后生成不寻常的二聚产物4 [2-(C 6 F 5)2 B-4-(P(O)OEt
The reaction of boron alkynes and boron azides leads to rare N3BC heterocycles resulting from aromaticCHactivation of benzene and toluene. While subsequent treatment with PMe3 gave the PB adduct with the exocyclic boron, reaction with PtBu3 effected deprotonation of the heterocycle to give the corresponding phosphonium salt.
Bulletin of the Chemical Society of Japan, Ahead of Print.
日本化学会会刊,印刷前。
Cycloaddition reactions of (C<sub>6</sub>F<sub>5</sub>)<sub>2</sub>BN<sub>3</sub> with dialkyl acetylenedicarboxylates
作者:Rebecca L. Melen、Douglas W. Stephan
DOI:10.1039/c5dt00316d
日期:——
The 1,3-dipolar cycloaddition reactions of the electron deficient boron azide, (C6F5)2BN3 (1) with the electron-poor acetylenes RO2CCCCO2R (R = Me, Et) afforded the new mono- and bis-1,2,3-triazole derivatives 5 and 6.