有机硒催化肟转化为腈或酮

Organoselenium-Catalyzed Conversion of Oximes to Nitriles or Ketones

1-氟吡啶三氟甲烷磺酸盐(FP-OTf)和二苯基二硒醚在空气中反应生成苯次硒酸和苯亚硒酸,这种混合物可以催化醛肟和酮肟分别转化腈或酮.通过改变二苯基二硒醚的用量及其与FP-OTf的物质的量之比,能够提高以上两类反应的催化效果.当二苯基二硒醚用量为5 mol%,FP-OTf的用量为4 mol%时,可以催化醛肟以较高的产率转化为腈(57%~94%),而在酮肟转化为酮的反应中,二苯基二硒醚的用量为2.5 mol%,且与FP-OTf的物质的量之比为1∶1.2时,产率较高(74%~91%).

Phenylselenenic acid and phenylseleninic acid were formed in situ in the reaction of diphenyl diselenide with 1-fluoropyridine trifluoromethane sulfonate(FP-OTf)in air.This mixture can catalyze the conversion of aldoxime to nitrile or ketoxime to ketone,respectively.The catalytic effect on those two kinds of reactions can be improved by changing the amount of diphenyl diselenide and the ratio of diphenyl diselenide to FP-OTf.Nitriles were obtained from the open-air reaction of aldoxime catalyzed by the mixture of diphenyl diselenide(5 mol%)and FP-OTf(4 mol%)with the yields of 57%~94%.In the conversion of ketoximes to ketones,higher yields of ketones(74%~91%)were obtaied when the ratio of diphenyl diselenide to FP-OTf was 1∶1.2 and the dosage of diphenyl diselenide was 2.5 mol%.