A new method for the addition of SF5Cl on unsaturated compounds was developed, based on the use of an electron donor-acceptor (EDA)-complex and visible light irradiation. The reaction does not require the presence of oxygen to proceed, compared to the most-common SF5Cl addition protocols. A total of 19 examples of alkenes and alkynes were performed, with yields ranging from 31 % to 86 %.
A new reagent has been designed through 2-electron activation of SF6 with commercially available tetrakis(dimethylamino)ethylene (TDAE) under blue LED irradiation. The versatility of this new SF5-based reagent has been demonstrated for the deoxyfluorination of CO2 and the fluorinative desulfurization of CS2 affording useful fluorinated amines. Moreover, SF5Cl could be generated under mild conditions
一种新的试剂通过在蓝色 LED 照射下用市售的四(二甲氨基)乙烯 (TDAE)对 SF 6进行 2 电子活化而设计。这种新型 SF 5基试剂的多功能性已被证明可用于 CO 2的脱氧氟化和 CS 2的氟化脱硫,从而提供有用的氟化胺。此外,SF 5 Cl 可以在温和的条件下由试剂I生成,允许烯烃和炔烃的氯代五氟硫烷基化。
Improved and facile addition reactions of pentafluorosulfanyl bromide
作者:Dong Sung Lim、Silvana C. Ngo、Sankar G. Lal、Kristen E. Minnich、John T. Welch
DOI:10.1016/j.tetlet.2008.07.080
日期:2008.9
A solution of SF(5)Br in CCl(3)F (0.5-1 M) Was utilized to effect the addition of pentafluorosulfanyl bromide (SF(5)Br) to olefins. The reaction of the SF5Br solution in the presence of triethylborane (0.1 equiv) With an olefin over 20 min at 0 degrees C gave pentafluorosulfanylated compound 2(a-f) in high yield (Table 2). An efficient route for the preparation of synthetically useful SF5-containing esters is also described. (C) 2008 Elsevier Ltd. All rights reserved.