Intramolecular sulphonyl-amidomethylation. Part I. Cyclization of benzylsulphonamides
作者:Orfeo O. Orazi、Renée A. Corral、Rodolfo Bravo
DOI:10.1002/jhet.5570230620
日期:1986.11
strong acid media is a synthetically useful route to 3,4-dihydro-1H-2,3-benzothiazine2,2-dioxides III. With insufficient acid strength or reaction time, kinetic products IV and VI are obtained; the latter compounds can be converted into the thermodynamic products III under stronger conditions. The reactions proceed via imine VII or iminium VIII compounds as common intermediates.
在强酸介质中苄基磺酰胺与醛的环化是合成3,4-二氢-1 H -2,3-苯并噻嗪2,2-二氧化物III的合成途径。在不足的酸强度或反应时间的情况下,获得了动力学产物IV和VI。后者的化合物可以在更强的条件下转化为热力学产物III。反应通过亚胺VII或亚胺VIII化合物作为常见中间体进行。
Fluorous-tethered quenching reagents for solution phase parallel synthesis
作者:Craig W. Lindsley、Zhijian Zhao、William H. Leister
DOI:10.1016/s0040-4039(02)00748-7
日期:2002.6
Commercially available fluorous-tethered reagents are employed to quench excess reactants and remove known impurities from crude reaction mixtures generated via solutionphaseparallelsynthesis. Fluorous quenching reagents are expediently removed via FluoroFlash™ SPE columns to afford products in high yields and purities.
AN EFFICIENT SYNTHESIS OF 3,4-DIHYDRO-1H-2,3-BENZOTHIAZINE 2,2-DIOXIDES USING AMBERLYST 15 AND AMBERLYST XN 1010
作者:Rodolfo D. Bravo、Alicia S. Cánepa
DOI:10.1081/scc-120014987
日期:2002.1
ABSTRACT Resins Amberlyst 15 and Amberlyst XN 1010 are used in the synthesis of 3,4-dihydro-1H-2,3-benzothiazines 2,2-dioxide. Advantages of this new procedure are simple work-up, high yield and selectivity, easy recovery of the catalyst and no waste problems.
Sulfur-Phenolate Exchange as a Mild, Fast, and High-Yielding Method toward the Synthesis of Sulfonamides
作者:Alyssa F. J. van den Boom、Han Zuilhof
DOI:10.1021/acs.orglett.2c04292
日期:2023.2.10
Sulfonamides have many important biological applications, yet their synthesis often involves long reaction times under dry and non-ambient conditions. Here we report the synthesis of a large range of sulfonamides at room temperature using 4-nitrophenyl benzylsulfonate as a starting material. Sulfonamides were prepared from a wide range of aliphatic, linear, and cyclic amines, anilines, and N-methylanilines