Electrochemical synthesis of sulfinic esters from alcohols and thiophenols
作者:Yang He、Jinli Zhang、Liang Xu、Yu Wei
DOI:10.1016/j.tetlet.2020.151631
日期:2020.3
Electrochemical oxidative couplings between S–H and O–H bonds are achieved herein directly from readily-available alcohols and thiophenols, affording a series of diverse sulfinic esters. This strategy can take advantage of 6 equivalents of alcohol, relative to thiophenol, to achieve moderate to good yields, without the assistance of any metallic catalysts, bases, and additional oxidants.
A convenient and efficient method for the synthesis of various structurally functionalized sulfinates shows good substrate generality of alcohols and sodium sulfinates.
Reaction of alcohols with sodium arenesulfinates could afford either sulfones or sulfinates, and O‐attack of sulfinate anions onto in situ generated carbocation intermediates from alcohols was the previous proposed mechanism in many syntheses of sulfinates. This concept, which is often used consciously or unconsciously, was revised herein by using isotopic labeling experiments and development of an
A mixed anhydride approach to the preparation of sulfinate esters and allylic sulfones: Trimethylacetic p-toluenesulfinic anhydride
作者:Eric Jacobsen、Mihir K. Chavda、Kokou M. Zikpi、Stephanie L. Waggoner、Daniel J. Passini、Jesse A. Wolfe、Robert Larson、Chelsea Beckley、Christopher G. Hamaker、Shawn R. Hitchcock
DOI:10.1016/j.tetlet.2017.06.074
日期:2017.8
anhydride. This reagent has been used to prepare a series of sulfinate esters from primary and secondary alcohols. In addition, the reagent was used to convert Baylis-Hillman substrates into allylic sulfones. Attempts to use the reagent to convert amines to sulfinamides were unsuccessful. In contrast, the use of 2-pyrrolidinone afforded N-p-toluenesulfinyl pyrrolidinone in 64% yield. The use of a chiral
甲苯亚磺酸和三甲基乙酰氯的试剂组合产生推定的三甲基乙酸对甲苯磺酸亚酐。该试剂已用于从伯醇和仲醇制备一系列亚磺酸酯。此外,该试剂用于将Baylis-Hillman底物转化为烯丙基砜。尝试使用该试剂将胺转化为亚磺酰胺的尝试均未成功。与此相反,使用2-吡咯烷酮,得到ñ - p在64%收率-toluenesulfinyl吡咯烷酮。使用手性4-苄基-1,3-恶唑烷酮或4-苄基-1,3-恶唑烷-2-硫酮导致的隔离的小号- p -甲苯基p -toluenethiosulfonate。
Sulfination of Alcohols with<i>p</i>-Toluenesulfonylmethyl Isocyanide under Metal-Free Conditions: A Mitsunobu Approach
A Mitsunobu approach for the synthesis of sulfinate esters by direct nucleophilic substitution of alcohols is described. The salient features of this strategy include neutral and metal‐free conditions for the rapid synthesis of sulfinates in high yields. The present protocol using p‐toluenesulfonylmethyl isocyanide (TosMIC) and the triphenylphosphine (TPP)/diisopropyl azodicarboxylate (DIAD) reagent