extensive studies on FSO2+‐type reagents, a radicalfluorosulfonylation reaction with a fluorosulfonyl radical (FSO2.) remains elusive so far, probably owing to its instability and difficulty in generation. Herein, the development of the first radicalfluorosulfonylation of alkenes based on FSO2 radicals generated under photoredox conditions is reported. This radical approach provides a new and general access
A Synthesis of “Dual Warhead” β-Aryl Ethenesulfonyl Fluorides and One-Pot Reaction to β-Sultams
作者:Praveen K. Chinthakindi、Kimberleigh B. Govender、A. Sanjeeva Kumar、Hendrik G. Kruger、Thavendran Govender、Tricia Naicker、Per I. Arvidsson
DOI:10.1021/acs.orglett.6b03634
日期:2017.2.3
boron-Heck coupling that is compatible with the ethenesulfonyl fluoride functional group. The protocol proceeds at room temperature with chemoselectivity and E-isomer selectivity and offers facile access to a wide range of β-aryl/heteroaryl ethenesulfonyl fluorides from commercial boronic acids. Furthermore, we demonstrate a “one-pot click” reaction to directly transform the products to aryl-substituted β-sultams
directing character of the SO2F group, being ahead of bromine and methoxy substituents. Under the same metalation conditions, aryl fluorosulfates (ArOSO2F) display fragmentation to arynes and migration of the SO2F group to the ortho position (anionic thia-Fries rearrangement). Studies on directed ortho-metalation (DoM) of arenesulfonyl fluorides (ArSO2F) with in situ electrophile trapping are presented
Palladium-Catalyzed Fluorosulfonylvinylation of Organic Iodides
作者:Gao-Feng Zha、Qinheng Zheng、Jing Leng、Peng Wu、Hua-Li Qin、K. Barry Sharpless
DOI:10.1002/anie.201701162
日期:2017.4.18
A palladium‐catalyzed fluorosulfonylvinylation reaction of organiciodides is described. Catalytic Pd(OAc)2 with a stoichiometric amount of silver(I) trifluoroacetate enables the coupling process between either an (hetero)aryl or alkenyl iodide with ethenesulfonyl fluoride (ESF). The method is demonstrated in the successful syntheses of eighty‐eight otherwise difficult to access compounds, in up to