The kinetics of the reaction of carbonsuboxide with aryl-substituted 2-hydroxybenzaldehydeoximes to give coumarin derivatives have been studies. A Hammett plot gave a ρ value of ca.–1.5, indicating that the reaction was promoted by electron-releasing groups para to the oxime function. Increasing the dielectric constant of the solvent raises the reaction rate; we have therefore proposed the formation
An efficient synthesis of oxazolines <i>via</i> a cascade reaction between azaoxyallyl cations and 1,2-benzisoxazoles
作者:Li Sun、Yi Liu、Yankai Wang、Yuanyuan Li、Zhiwen Liu、Tao Lu、Wenhai Li
DOI:10.1039/c9ob01366k
日期:——
A formal [3 + 2] cycloaddition reactionbetween the C and O terminals of azaoxyallyl cations formed in situ and 1,2-benzisoxazoles has been realized. This one-pot cycloaddition method provided an effective and practical pathway to synthesize oxazoline in good yields under mild conditions. The title products exhibited unique fluorescence properties.
[3 + 2]-Cycloaddition of Azaoxyallyl Cations with 1,2-Benzisoxazoles: A Rapid Entry to Oxazolines
作者:Juan Feng、Ming Zhao、Xuanzi Lin
DOI:10.1021/acs.joc.9b01166
日期:2019.8.2
novel and efficient [3 + 2] cycloaddition reaction of azaoxyallyl cations and 1,2-benzisoxazoles to give oxazoline derivatives has been developed. The transformation provides a rapid entry to functionalized oxazoline scaffolds under mild and transition-metal-free conditions, which will greatly expand the reaction types of heterocycle chemistry and pave the way for syntheses of bioactivecompounds.
A mild procedure for the production of secondary amines from oximes and benzisoxazoles
作者:Mark Searcey、Sukhwant S. Grewal、Fiorenza Madeo、Petros G. Tsoungas
DOI:10.1016/s0040-4039(03)01623-x
日期:2003.8
2-Hydroxybenzaldoximes are reduced under mild conditions of ammonium formate/Pd–C in methanol to give secondary amines. Benzisoxazoles react under the same mild conditions to give the same products. A possible mechanism is suggested, involving the intermediacy of the benzisoxazole in the oxime conversion.