Titanium-Promoted Acylation of Sulfonamides toN-Acylsulfonamide PPARαAntagonists
摘要:
The direct acylation of sulfonamides by esters represents an attractive strategy in organic chemistry, being an interesting alternative to classical approaches to N-acylsulfonamides. Here is described a simple and effective method to obtain N-acylsulfonamides of pharmaceutical interest, in a reaction promoted by titanium(IV) chloride. This strategy was successfully applied to the synthesis of a peroxisome proliferator-activated receptor antagonist with a benzenesulfonimide moiety, ensuring an excellent yield of product. The reaction was further studied to explore the behavior of different -bromoesters and esters and the effects of para-substitution in the benzenesulfonamide moiety.
Benzyl anion transfer in the fragmentation of N-(phenylsulfonyl)-benzeneacetamides: a gas-phase intramolecular S<sub>N</sub>Ar reaction
作者:Shanshan Shen、Yunfeng Chai、Yaqin Liu、Chang Li、Yuanjiang Pan
DOI:10.1039/c5ob01582k
日期:——
substitution (SNAr) during the course of tandem massspectrometry of deprotonated N-(phenylsulfonyl)-benzeneacetamide. Upon collisional activation, the formation of the initial ion/neutral complex ([C6H5CH2−/C6H5SO2NCO]), which was generated by heterolytic cleavage of the CH2–CO bond, is proposed as the key step. Subsequently, the anionic counterpart, benzyl anion, is transferred to conduct the intra-complex
在这项研究中,我们报告了在去质子化的N-(苯基磺酰基)-苯乙酰胺串联质谱过程中通过分子内芳香族亲核取代(S N Ar)气相气相苄基阴离子转移。一旦碰撞活化,初始离子的形成中性络合物([C / 6 ħ 5 CH 2 - / C 6 H ^ 5 SO 2 NCO]),这是由CH的异裂产生的2 -CO键,被提议作为关键步骤。随后,将阴离子对应物苄基阴离子转移以进行内络合物S NAr反应。失去中性HNCO后,该中间体在m / z 231处产生产物离子B,通过比较多级光谱与去质子化的2-苄基苯亚磺酸和(苄基磺酰基)苯的谱图确认了其结构。此外,帧内复杂质子转移也是复杂的[C内观察到6 ħ 5 CH 2 - / C 6 H ^ 5 SO 2 NCO]以产生产物离子Ç在米/ Ž 182. INC介导的机制被证实理论计算,同位素实验,击穿曲线,取代基实验,等。这项工作可以进一步了解气态苄基阴离子的理化性质。
An expeditious and convenient synthesis of acylsulfonamides utilizing polymer-supported reagents
作者:Ying Wang、Kathy Sarris、Daryl R. Sauer、Stevan W. Djuric
DOI:10.1016/j.tetlet.2007.05.158
日期:2007.7
Acylsulfonamides can be rapidly and conveniently synthesized from a variety of carboxylic acids and sulfonamides utilizing the commercially available reagents, PS-DCC and DMAP under mild reaction conditions. DMAP can be efficiently scavenged by utilization of a silica-supported tosic acid cartridge (Si-SCX). In most of the cases studied, products with high purities and yields were obtained without