Efficient Difluoromethylation of Alcohols Using TMSCF<sub>2</sub>Br as a Unique and Practical Difluorocarbene Reagent under Mild Conditions
作者:Qiqiang Xie、Chuanfa Ni、Rongyi Zhang、Lingchun Li、Jian Rong、Jinbo Hu
DOI:10.1002/anie.201611823
日期:2017.3.13
difluoromethylation of alcohols using commercially available TMSCF2Br (TMS=trimethylsilyl) as a unique and practical difluorocarbene source is developed. This method allows primary, secondary, and even tertiary alkyl difluoromethyl ethers to be synthesized under weakly basic or acidic conditions. The reaction mainly proceeds through the direct interaction between a neutral alcohol and difluorocarbene
Rapid Deoxyfluorination of Alcohols with
<i>N</i>
‐Tosyl‐4‐chlorobenzenesulfonimidoyl Fluoride (SulfoxFluor) at Room Temperature
作者:Junkai Guo、Cuiwen Kuang、Jian Rong、Lingchun Li、Chuanfa Ni、Jinbo Hu
DOI:10.1002/chem.201901176
日期:2019.5.28
2‐pyridinesulfonyl fluoride (PyFluor) in fluorination rate, and is also superior to perfluorobutanesulfonyl fluoride (PBSF) in fluorine‐economy. Its reaction with alcohols not only tolerates a wide range of functionalities including the more sterically hindered alcoholic hydroxyl groups, but also exhibits high fluorination/elimination selectivity. Because SulfoxFluor can be easily preparedfrom inexpensive
Deoxyfluorination of alcohols with aryl fluorosulfonates
作者:Xiu Wang、Min Zhou、Qinghe Liu、Chuanfa Ni、Zhongbo Fei、Wei Li、Jinbo Hu
DOI:10.1039/d1cc02617h
日期:——
Aryl fluorosulfonates are developed as a deoxyfluorinating reagent in the transformation of primary and secondary alcohols into the corresponding alkyl fluorides. These reagents feature easy availability, low-cost, high stability and high efficiency. Diverse functionalities including aldehyde, ketone, ester, halogen, nitro, alkene, and alkyne are well tolerated under mild reaction conditions.
New 5-hydroxy-2-furanone compounds having anti-inflammatory, immunosuppressive and anti-proliferative activity and are useful in treating psoriasis and modifying calcium homeostasis.
A facile synthesis of aryldihydropyrans using a Sonogashira–selenoetherification strategy
作者:Margaret A Brimble、Gabrielle S Pavia、Ralph J Stevenson
DOI:10.1016/s0040-4039(02)00065-5
日期:2002.2
with a range of phenyl and naphthyl bromides affords the appropriate aryl acetylenic alcohols which then undergo ready reduction to the corresponding (E)-1-aryl-5-hydroxyalkenes. Subsequent selenoetherification of the (E)-5-hydroxyalkenes proceeds via a 6-endo-trig pathway cleanly affording the trans-2-aryl-3-phenylselenyltetrahydropyrans. Finally oxidativeelimination of the selenides afforded the 2-aryl-2