描述了一种大规模生产1-苯磺酰基哌啶和其他亚磺酰胺的改进方案。结果表明,在三氟甲磺酸酐介导的硫糖苷活化中,1-苯亚磺酰基吡咯烷和N,N-二乙基苯亚磺酰胺的作用类似于1-苯亚磺酰基哌啶,而且它们的结晶性较弱,因此它们可在-78°C下使用到将1-苯亚磺酰基哌啶保持在溶液中所需的-60°C。N,N-二环己基苯磺酰胺不会与三氟甲磺酸酐结合活化硫糖苷,这归因于其较大的空间体积。*致谢Jacques H. Van Boom教授。
Highly Chemoselective NH- and O-Transfer to Thiols Using Hypervalent Iodine Reagents: Synthesis of Sulfonimidates and Sulfonamides
作者:Arianna Tota、Sahra St John-Campbell、Edward L. Briggs、Gala Ogalla Estévez、Michelle Afonso、Leonardo Degennaro、Renzo Luisi、James A. Bull
DOI:10.1021/acs.orglett.8b00788
日期:2018.5.4
converted to sulfonimidates or sulfonamides with three new S–X connections being made selectively in one pot. Using hypervalent iodine reagents in the presence of ammonium carbamate, NH- and O-groups are transferred under mild and practical conditions. Reducing the loading of ammonium carbamate changed the product distribution, converting the sulfonimidate to the sulfonamide. Studies into the possible
Metal-Free Cross-Coupling of Arylboronic Acids and Derivatives with DAST-Type Reagents for Direct Access to Diverse Aromatic Sulfinamides and Sulfonamides
作者:Qiang Wang、Xiang-Ying Tang、Min Shi
DOI:10.1002/anie.201605066
日期:2016.8.26
We have developed a simple and convenient method for the cross‐coupling of arylboronicacids and their derivatives with DAST‐type reagents under mild and metal‐freeconditions to directly afford sulfinamides in moderate to good yields. Moreover, sulfonamides were obtained after a simple oxidation reaction. The reaction mechanism was investigated by 18O‐labeling experiments, and the synthetic utility
An NH transaction: The first direct synthesis of tertiary NH sulfonimidamides from tertiary sulfinamides by electrophilic NH transfer has been achieved. In vitro studies did not reveal any intrinsic flaw of the sulfonimidamide group regarding properties relevant to medicinal chemistry.
Direct Synthesis of Sulfinamides by the Copper-Catalyzed Electrophilic Amidation of Sulfenate Anions
作者:Qiang Dai、Junliang Zhang
DOI:10.1002/adsc.201701510
日期:2018.3.20
A method for the construction of sulfinamides via the copper‐catalyzedelectrophilic amination of sulfenate anions usingN‐benzoyloxyamines as the amination reagents. This procedure featured with the capture of in‐situ generated sulfenate anions from β‐sulfinyl esters under mild conditions, which provides an efficient strategy for the synthesis of diverse sulfinamides in moderate to good yields.
Various alkoxy(N-tert-butylamino)(methyl)sulfonium triflates are prepared by selective O-alkylation of N-tert-butylmethanesulfinamide (4c) with primary alkyl trifluoromethanesulfonates (triflates). Successive treatment of thus formed alkoxyaminosulfonium salts with DBU smoothly affords the corresponding aldehydes in good yields. The sequential combination of the two reactions provides a new method for oxidation of primary alkyl triflates to aldehydes, and the present study suggests the existence of alkoxysulfilimines as intermediates of the previously-reported direct oxidation of alcohols by using N-tert-butylphenylsulfinimidoyl chloride (1a) and DBU.