N-p-Toluenesulfinylimidazole: A New in situ Reagent for the Mild and Efficient Synthesis of p-Toluenesulfinate Alkyl Esters and Aryl Esters
作者:Shawn R. Hitchcock、Jessica L. Shaw、Brad J. Austermuehle、Jordan M. Witte、Timothy R. Dorsey、Christina Delach、Christopher G. Hamaker
DOI:10.1055/a-1472-7578
日期:2021.8
A new synthetic methodology has been developed for the synthesis of sulfinate alkyl and aryl esters. The methodology involves the combination of p-toluenesulfinic acid and 1,1′-carbonyldiimidazole (CDI) to create the putative reagent sulfinylimidazole. The process spontaneously releases carbon dioxide upon the addition of the CDI to the acid suggesting the rapid formation of the proposed reagent. Reaction
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。
Efficient Synthesis of Sulfinate Esters and Sulfinamides via Activated Esters of p-Toluenesulfinic Acid
nucleophilic attack on the activated p-toluenesulfinic acid anhydride. Ultimately, the use of EDC-HCl to form the sulfinamides proved to be the best pathway for synthesis. Sulfinate esters were prepared by the process of activating p-toluenesulfinic acid with either cyanuric chloride, methanesulfonyl chloride, or 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (EDC-HCl). Activation of p-toluenesulfinic