Greener fluorous chemistry: Convenient preparation of new types of ‘CF3-rich’ secondary alkyl mesylates and their use for the synthesis of azides, amines, imidazoles and imidazolium salts
作者:Anikó Nemes、László Tölgyesi、Andrea Bodor、József Rábai、Dénes Szabó
DOI:10.1016/j.jfluchem.2010.10.001
日期:2010.12
alcohol were used as precursors for the preparation of the appropriate bis(polyfluoroalkoxymethyl)carbinols [(RFHOCH2)2CHOH, 1a–c, RFH = (a) CF3CH2, (b) (CF3)2CH, and (c) (CF3)3C] and the corresponding mesylates [(RFHOCH2)2CHOSO2CH3, 2a–c]. This novel design paradigm is introduced to eliminate the persistence and bioaccumulation problems of fluorous chemistry, which are associated with the use of longer
2,2,2-三氟乙醇,1,1,1,3,3,3-六氟-2-丙醇和九氟叔丁醇被用作制备适当的双(聚氟烷氧基甲基)甲醇[[( R FH OCH 2)2 CHOH,1a – c,R FH =(a)CF 3 CH 2,(b)(CF 3)2 CH,和(c)(CF 3)3 C]和相应的甲磺酸酯[( ř FH OCH 2)2 CHOSO 2 CH 3,图2a - ç]。这种新颖的设计范例被引入到消除氟化学持久性和生物蓄积性问题,这是与使用较长的直链全氟烷基团的相关联的(例如,R FN ≥ Ñ -C 8 ˚F 17,Ñ -C 7 ˚F 15)。仲甲磺酸酯2a,b和主要甲苯磺酸酯[(CF 3)3 COCH 2 CH 2 OTs,2d ]对叠氮化物和咪唑亲核试剂表现出可接受的反应性,从而可以合成新型氟叠氮化物,该叠氮化物在与H 2氢解后/的Pd-C提供氟胺[(R FH OCH 2)2 CHNH 2,图8a,b