作者:Kevin P. Gable、Eric C. Brown
DOI:10.1055/s-2003-42076
日期:——
Transfer of oxygen atoms from epoxides to triphenylphosphine is efficiently catalyzed by Tp′ReO3 [Tp′ = hydrido-tris-(3,5-dimethylpyrazolyl)borate] in benzene at 75-105 ºC. The reaction tolerates a wide variety of functional groups including ketones (conjugated or non-conjugated to the new double bond), esters, nitriles, ethers, silyl ethers and phthalimides. Relative rates vary with substitution pattern and electronics; in general, monosubstituted and 2,2-disubstituted epoxides react fastest, and cis-2,3-disubstituted systems react faster than trans. Electron-withdrawing substituents promote the reaction.
在75-105°C的苯溶液中,三(3,5-二甲基吡唑)硼酸氢盐-铼O3(Tp'ReO3)高效催化环氧化物向三苯基膦进行氧原子转移。该反应耐受多种官能团,包括酮(与新双键共轭或非共轭)、酯、腈、醚、硅醚和酞酰亚胺。相对反应速率随取代模式和电子性质变化;通常,单取代和2,2-二取代的环氧化物反应最快,顺式-2,3-二取代系统比反式更快。吸电子取代基促进反应进行。