本文报道了金催化的邻炔基苯磺酰胺与芳基重氮盐的双官能化。在用蓝色 LED 照射后,苯磺舒坦产物通过氨基芳基化形成,伴随着 N 2的释放。在没有辐照的情况下,芳基重氮盐作为有效的亲电试剂,促进乙烯基-Au(I) 中间体的亲电脱氢,然后互变异构化得到N-芳基取代的 α-亚氨基 ( E )-腙。6 -endo-dig和 5 -exo-dig环化的区域选择性非常好。
本文报道了金催化的邻炔基苯磺酰胺与芳基重氮盐的双官能化。在用蓝色 LED 照射后,苯磺舒坦产物通过氨基芳基化形成,伴随着 N 2的释放。在没有辐照的情况下,芳基重氮盐作为有效的亲电试剂,促进乙烯基-Au(I) 中间体的亲电脱氢,然后互变异构化得到N-芳基取代的 α-亚氨基 ( E )-腙。6 -endo-dig和 5 -exo-dig环化的区域选择性非常好。
Synthesis and biological evaluation of linear phenylethynylbenzenesulfonamide regioisomers as cyclooxygenase-1/-2 (COX-1/-2) inhibitors
作者:Raymond Anana、P.N. Praveen Rao、Qiao-Hong Chen、Edward E. Knaus
DOI:10.1016/j.bmc.2006.03.050
日期:2006.8
A group of regioisomeric phenylethynylbenzenesulfonamides possessing a COX-2 SO2NH2 pharmacophore at the para-, meta- or ortho-position of the C-1 phenyl ring, in conjunction with a C-2 substituted-phenyl (H, OMe, OH, Me, F) group, were synthesized and evaluated as inhibitors of the cyclooxygenase-1 (COX-1) and cyclooxygenase-2 (COX-2) isozymes. The target 1,2-diphenylacetylenes were synthesized via a palladium-catalyzed Sonogashira cross-coupling reaction. In vitro COX-1/-2 isozyme inhibition structure-activity data showed that COX-1/-2 inhibition and the COX selectivity index (SI) are sensitive to the regioisomeric placement of the COX-2 SO2NH2 pharmacophore where the COX-2 potency order for the benzenesulfonamide regioisomers was generally meta > para and ortho. Among this group of compounds, the in vitro COX-1/-2 isozyme inhibition studies identified 3-(2-phenylethynyl)benzenesulfonamide (10a) as a COX-2 inhibitor (COX-2 IC50 = 0.45 mu M) with a good COX-2 selectivity (COX-2 SI = 70). In contrast, 2-[2-(3-fluorophenyl)ethynyl]benzenesulfonamide (11c) possessing a SO2NH2 COX-2 pharmacophore at the ortho-position of the C-1 phenyl ring exhibited COX-1 inhibition and selectivity (COX-1 IC50 = 3.6 mu M). A molecular modeling study where 10a was docked in the binding site of COX-2 shows that the tneta-SO2NH2 COX-2 pharmacophore was inserted inside the COX-2 secondary pocket (Arg513, Phe518, Val523, and His90). Similar docking of 10a within the COX-1 binding site shows that the meta-SO2NH2 pharmacophore is unable to interact with the respective amino acid residues in COX-1 that correspond to those near the secondary pocket in COX-2 due to the presence of the larger Ile523 in COX-1 that replaces Va1523 in COX-2. (c) 2006 Elsevier Ltd. All rights reserved.
Switchable Divergent Synthesis in Gold-Catalyzed Difunctionalizations of <i>o</i>-Alkynylbenzenesulfonamides with Aryldiazonium Salts
作者:Jun Li、Hongwei Shi、Shan Zhang、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1021/acs.orglett.1c02621
日期:2021.10.15
Gold-catalyzed difunctionalizations of o-alkynylbenzenesulfonamides with aryldiazonium salts are reported herein. Upon irradiation with the blue LEDs, benzosultam products were formed via aminoarylation accompanied by the release of N2. Without irradiation, aryldiazonium salts were engaged as efficient electrophiles, facilitating electrophilic deaurations of the vinyl-Au(I) intermediates, followed
本文报道了金催化的邻炔基苯磺酰胺与芳基重氮盐的双官能化。在用蓝色 LED 照射后,苯磺舒坦产物通过氨基芳基化形成,伴随着 N 2的释放。在没有辐照的情况下,芳基重氮盐作为有效的亲电试剂,促进乙烯基-Au(I) 中间体的亲电脱氢,然后互变异构化得到N-芳基取代的 α-亚氨基 ( E )-腙。6 -endo-dig和 5 -exo-dig环化的区域选择性非常好。