Novel reactions of N-sulfonylamines with 3-dimethylamino-2H-azirines. Competitive formation of 1,2,5-thiadiazoles, 1,2,3-oxathiazoles and acrylamidines. X-Ray molecular structure of N-(4-dimethylamino-5-methyl-2-oxo-5-phenyl-5H-1,2λ6,3-oxathiazol-2-ylidene)benzamide
摘要:
Reaction of 3-dimethylamino-2,2-diphenyl-2H-azirine 3a with N-sulfonylalkylamines 2a,b provides 1,2,5-thiadiazoles 5a,b, whereas use of N-carbonylsulfonylamines 2c,e as reaction partners primarily results in 1,2,3-oxathiazoles 6a,b which isomerise to the corresponding thiadiazoles 5c,d on treatment with silica gel at room temperature. In contrast, use of 2-alkyl-3-dimethylamino-2-phenyl-2H-azir 3b,c in the reaction with the N-sulfonylamide 2c and the N-sulfonylcarbamates 2e,f leads to mixtures of thiadiazoles 5 and oxathiazoles 6 along with isomeric acrylamidines 7.
[EN] PEPTIDYL NITRILES AND USE THEREOF AS DIPEPTIDYL PEPTIDASE I INHIBITORS [FR] PEPTIDYL-NITRILES ET LEUR UTILISATION EN TANT QU'INHIBITEURS DE LA DIPEPTIDYLPEPTIDASE I
A New Method for the Stereoselective Synthesis of α- and β-Glycosylamines Using the Burgess Reagent
作者:K. C. Nicolaou、Scott A. Snyder、Annie Z. Nalbandian、Deborah A. Longbottom
DOI:10.1021/ja049293c
日期:2004.5.1
Although glycosylamines constitute an important group of carbohydrates from the standpoint of biology and medicine, methods for their synthesis typically lack substrate generality and/or result in variable stereoselectivity, especially in complex contexts. In this communication, we report an operationally simple method for the synthesis of both α- and β-glycosylamines using the Burgessreagent that overcomes
A novel preparation of sulfilimines from the corresponding sulfoxides using the Burgess reagent is described. The reaction is general to dialkyl- and aryl alkyl sulfoxides and proceeds under mild conditions in benzene. A variety of protecting groups can be introduced on the nitrogen of the sulfilimine by choosing the appropriate Burgess reagent.
Optimization of cyclic sulfamide derivatives as 11β-hydroxysteroid dehydrogenase 1 inhibitors for the potential treatment of ischemic brain injury
作者:Jeong Hyun Lee、Ju Hwan Bok、Sung Bum Park、Haushabhau S. Pagire、Yoon-Ju Na、Eunyoung Rim、Won Hoon Jung、Jin Sook Song、Nam Sook Kang、Ho Won Seo、Kwan-Young Jung、Byung Ho Lee、Ki Young Kim、Jin Hee Ahn
DOI:10.1016/j.bmcl.2019.126787
日期:2020.1
therapeutic target for various disease conditions. Moreover, a recent study demonstrated that selective 11β-HSD1 inhibitor can attenuate ischemic brain injury. This prompted us to optimize cyclic sulfamidederivative for aiming to treat ischemic brain injury. Among the synthesized compounds, 6e has an excellent in vitro activivity with an IC50 value of 1 nM toward human and mouse 11β-HSD1 and showed good
Crystal Structure of Burgess Inner Salts and their Hydrolyzed Ammonium Sulfaminates
作者:Anthony J. Arduengo III、Yosuke Uchiyama、David A. Dixon、Monica Vasiliu
DOI:10.1071/ch19338
日期:——
with gentle warming under vacuum was isolated and characterised. Structures of the hydrosylates from both the methyl- and ethyl-amidate esters were determined from X-ray crystallographic analysis and are reported. The crystalstructures of the Burgess inner salts exhibit geometries at the sulfur atoms that are intermediate between a planar O2S=NCO2R unit and tetrahedral 4-coordinate sulfur centres that
Burgess试剂及其类似的乙酯的固态结构揭示了表明三乙胺溶剂化的磺酰酰亚胺的结构,而不是更常见的三乙基磺酰胺基酰胺化物。目前的研究不支持Burgess试剂可逆形成的水合物的存在,而是分离并表征了在真空下温和加热下不会还原为Burgess试剂的水解产物。由X-射线晶体学分析确定并报道了氨基甲酸甲酯和氨基甲酸乙酯两者的羟基化物的结构。伯吉斯内盐的晶体结构在位于平面O 2 S = NCO 2之间的硫原子处表现出几何形状从三乙胺氮和硫之间的强单键(配位键)可以预期到R单元和四面体4配位的硫中心。水解的氨基磺酸铵是由三乙基铵离子,Et 3 NH +和N-(烷氧基羰基)氨基磺酸酯,O(-)SO 2 NHCO 2 R R = CH 3或C 2 H 5 }组成的水溶性分子间盐。
Burgess Reagent Facilitated Alcohol Oxidations in DMSO
作者:Prakash R. Sultane、Christopher W. Bielawski
DOI:10.1021/acs.joc.6b02629
日期:2017.1.20
Burgess reagent ([methoxycarbonylsulfamoyl]triethylammonium hydroxide) has historically found utility as a dehydrating agent. Herein we show that, in the presence of dimethyl sulfoxide, the Burgess reagentefficiently and rapidly facilitates the oxidation of a broad range of primary and secondary alcohols to their corresponding aldehydes and ketones in excellent yields and under mild conditions, and can