Oxidative cyclization of N-alkyl-o-methyl-arenesulfonamides to biologically important saccharin derivatives
摘要:
Various biologically important saccharin skeletons and their N-alkyl derivatives have been efficiently prepared by chromium(VI) oxide catalyzed H5IO6 oxidation of N-alkyl-o-methyl-arenesulfonamides in acetonitrile. N-tert-Butyl saccharin skeletons were easily prepared by H5IO6-CrO3 oxidation of N-tert-butyl-o-methyl arenesulfonamides in the presence of acetic anhydride. The method that furnished the novel fluoro and trifluoromethyl substituted saccharin skeletons is characterized by two steps, a simple work-up procedure, a single purification and good overall yields from substituted toluene derivatives. (c) 2006 Elsevier Ltd. All rights reserved.
A Broad‐Spectrum Catalytic Amidation of Sulfonyl Fluorides and Fluorosulfates**
作者:Mingjie Wei、Dacheng Liang、Xiaohui Cao、Wenjun Luo、Guojian Ma、Zeyuan Liu、Le Li
DOI:10.1002/anie.202013976
日期:2021.3.22
A broad‐spectrum, catalytic method has been developed for the synthesis of sulfonamides and sulfamates. With the activation by the combination of a catalytic amount of 1‐hydroxybenzotriazole (HOBt) and silicon additives, amidations of sulfonyl fluorides and fluorosulfates proceeded smoothly and excellent yields were generally obtained (87–99 %). Noticeably, this protocol is particularly efficient for
A novel palladium-catalyzedintramolecular reductive amination of ketones with the low nucleophilic sulfonamides has been developed in the presence of Bronsted acid, providing a wide range of chiral [gamma]-, [small delta]-,...
Copper-Catalyzed Formation of Sulfur-Nitrogen Bonds by Dehydrocoupling of Thiols with Amines
作者:Nobukazu Taniguchi
DOI:10.1002/ejoc.201000167
日期:2010.5
Copper-catalyzed formation of sulfur–nitrogen bonds can be performed by a dehydrocoupling of aryl thiols with amines. Sulfenamides or sulfonamides can be produced by the use of a copper catalyst in air or under oxygen atmosphere. Furthermore, a reaction involving the combination of a palladium catalyst and a copper catalyst selectively afforded sulfinamides.
USE OF 4-SUBSTITUTED 1-PHENYLPYRAZOLE-3-CARBOXYLIC ACID DERIVATIVES AS AGENTS AGAINST ABIOTIC PLANT STRESS
申请人:BAYER INTELLECTUAL PROPERTY GMBH
公开号:US20140329684A1
公开(公告)日:2014-11-06
The invention relates to the use of 4-substituted 1-phenylpyrazole-3-carboxylic acid derivatives of the general formula (I), or salts thereof,
where the radicals in the general formula (I) correspond to the definitions given in the description,
for enhancing stress tolerance in plants to abiotic stress, for strengthening plant growth and/or for increasing plant yield, and to selected processes for preparing the compounds mentioned above.
A macrolide compound represented by the formula (I) effective against erythromycin resistant bacteria (for example, resistant pneumococci, streptococci and mycoplasmas).