第一代氟DEAD试剂双(全氟己基乙基)偶氮二羧酸酯(C 6 F 13(CH 2)2 O 2 CN NCO 2(CH 2)2 C 6 F 13,F-DEAD-1)已证明相对于偶氮二羧酸二异丙酯表现不佳在困难的Mitsunobu反应中,涉及受阻醇或酸性较低的亲核试剂(苯酚)。两种带有丙烯间隔基而不是乙烯间隔基的新型第二代含氟试剂在扩大了反应范围的同时还保留了易于分离的氟的特征。“半氟”试剂全氟辛基丙基叔酸的副产物偶氮二羧酸丁酯(C 8 F 17(CH 2)3 O 2 CN NCO 2 t可以通过荧光快速色谱法除去Bu,F-DEAD-2),以及双(全氟己基丙基)偶氮二羧酸酯(C 6 F 13(CH 2)3 O 2 CN NCO 2(CH 2)3 C 6 F 13, F-DEAD-3)可通过氟固相萃取除去。新试剂有望为Mitsunobu反应中的分离问题提供通用和补充的解决方案,而不会限制反应范围。
Second Generation Fluorous DEAD Reagents Have Expanded Scope in the Mitsunobu Reaction and Retain Convenient Separation Features
作者:Sivaraman Dandapani、Dennis P. Curran
DOI:10.1021/jo0488098
日期:2004.12.1
show expanded reaction scope while retaining the easy fluorous separation features. Byproducts from “half fluorous” reagent perfluorooctylpropyl tert-butyl azo dicarboxylate (C8F17(CH2)3O2CNNCO2tBu, F-DEAD-2) can be removed by fluorous flash chromatography, and byproducts from bis(perfluorohexylpropyl)azo dicarboxylate (C6F13(CH2)3O2CNNCO2(CH2)3C6F13, F-DEAD-3) can be removed by fluorous solid-phase
第一代氟DEAD试剂双(全氟己基乙基)偶氮二羧酸酯(C 6 F 13(CH 2)2 O 2 CN NCO 2(CH 2)2 C 6 F 13,F-DEAD-1)已证明相对于偶氮二羧酸二异丙酯表现不佳在困难的Mitsunobu反应中,涉及受阻醇或酸性较低的亲核试剂(苯酚)。两种带有丙烯间隔基而不是乙烯间隔基的新型第二代含氟试剂在扩大了反应范围的同时还保留了易于分离的氟的特征。“半氟”试剂全氟辛基丙基叔酸的副产物偶氮二羧酸丁酯(C 8 F 17(CH 2)3 O 2 CN NCO 2 t可以通过荧光快速色谱法除去Bu,F-DEAD-2),以及双(全氟己基丙基)偶氮二羧酸酯(C 6 F 13(CH 2)3 O 2 CN NCO 2(CH 2)3 C 6 F 13, F-DEAD-3)可通过氟固相萃取除去。新试剂有望为Mitsunobu反应中的分离问题提供通用和补充的解决方案,而不会限制反应范围。
Chromatography-free product separation in the Mitsunobu reaction
作者:Anthony J. Proctor、Kevin Beautement、John M. Clough、David W. Knight、Yingfa Li
DOI:10.1016/j.tetlet.2006.05.070
日期:2006.7
Mitsunobu products can be isolated pure without column chromatography by first washing a solution of the crude reaction mixture in dichloromethane with 15% aqueous hydrogen peroxide followed by aqueous sodium sulfite. A final filtration through silica gel secures the pure Mitsunobu product. (c) 2006 Elsevier Ltd. All rights reserved.
Second-Generation Tags for Fluorous Chemistry Exemplified with a New Fluorous Mitsunobu Reagent
作者:Qianli Chu、Christopher Henry、Dennis P. Curran
DOI:10.1021/ol800750q
日期:2008.6.1
A new fluorous DEAD reagent bearing two perfluoro-tert-butyloxy groups with propylene spacers shows excellent promise for use in fluorous Mitsunobu reactions. Pure target products were obtained in good yields after removing fluorous byproducts by FSPE. The new reagent serves as a prototype for a greener second generation of fluorous reagents bearing tags that are not expected to degrade in the environment to compounds that are highly persistent or that bioaccumulate in higher organisms.