Deoxyfluorination of alcohols using N,N-diethyl-α,α-difluoro-(m-methylbenzyl)amine
摘要:
Deoxyfluorination of alcohols was carried out using N,N-diethyl-alpha,alpha-difluoro-(m-methylbenzyl)amine (DFMBA). Primary alcohols were effectively converted to fluorides under microwave irradiation or conventional heating. Deoxyfluorination of an anomeric hydroxy group in sugars by DFMBA proceeded at below room temperature and glycosyl fluorides could be obtained in good yields. The deoxyfluorination reaction chemoselectively proceeded and various protecting groups on the sugar can survive under the reaction conditions. (C) 2004 Elsevier Ltd. All rights reserved.
Tetrabutylammonium dihydrogentrifluoride: an efficient catalyst for regio and stereoselective conversion of epoxides to fluorohydrins under solid-liquid phase-transfer catalysis conditions.
作者:Dario Landini、Michele Penso
DOI:10.1016/s0040-4039(00)97281-2
日期:1990.1
Tetrabutylammonium dihydrogentrifluoride is an efficient and easy-to-handle hydrofluorinating agent in the ring-opening reaction of oxiranes to give good or excellent yields of fluorohydrins under solid-liquidPTCconditions.
Effective FluorinationReaction with Et<sub>3</sub>N˙3HF Under Microwave Irradiation
作者:Shoji Hara、Tomotake Inagaki、Tsuyoshi Fukuhara
DOI:10.1055/s-2003-39395
日期:——
Fluorination reaction of epoxides and alkyl mesylates can be effectively achieved by reaction with Et3NË3HF under microwave irradiation. The reaction time could be greatly reduced compared to the reaction under thermal conditions. The reactions were completed in a few minutes and the use of large excess of reagents could be avoided.
The ring-opening reaction of aliphatic epoxides with potassium fluoride-poly (hydrogen fluoride) is enhanced by a catalytic amount of triphenylphosphine. It is assumed that phosphonium fluoride species formed from triphenylphosphine work as fluorinating agents in this reaction.
iodoarene-catalyzed fluorination reactions as a terminal oxidant is reported. This reaction is effective for the fluorination of simple alkenes, aromatic alkenes and 1,3-dicarbonyl compounds, giving 1,2-difluorinated alkanes, geminal difluorinated compounds, 2-fluorinated-1,3-dicarbonyl compounds in good to high yields, respectively. This is a useful fluorination reaction that not only improves the issues
报道了一种新的 N−F 试剂,N , N '-二氟-2,2'-联吡啶鎓双(四氟硼酸盐),作为末端氧化剂用于碘芳烃催化的氟化反应。该反应可有效氟化简单烯烃、芳香烯烃和1,3-二羰基化合物,分别以良好至高产率生成1,2-二氟化烷烃、偕二氟化化合物、2-氟化-1,3-二羰基化合物。这是一种有用的氟化反应,不仅改善了使用传统 mCPBA 作为末端氧化剂的氟化反应的问题,而且构建了更简单的催化循环。本发明的NF试剂可以作为2,2'-联吡啶回收。