Scalable Negishi Coupling between Organozinc Compounds and (Hetero)Aryl Bromides under Aerobic Conditions when using Bulk Water or Deep Eutectic Solvents with no Additional Ligands
作者:Giuseppe Dilauro、Claudia S. Azzollini、Paola Vitale、Antonio Salomone、Filippo M. Perna、Vito Capriati
DOI:10.1002/anie.202101571
日期:2021.5.3
Pd‐catalyzed Negishi cross‐coupling reactions between organozinc compounds and (hetero)aryl bromides have been reported when using bulk water as the reaction medium in the presence of NaCl or the biodegradable choline chloride/urea eutectic mixture. Both C(sp3)‐C(sp2) and C(sp2)‐C(sp2) couplings have been found to proceed smoothly, with high chemoselectivity, undermildconditions (room temperature
C3-Thia and C3-carba isosteres of a carbocyclic influenza neuraminidase inhibitor, (3R,4R,5S)-4-acetamido-5-amino-3-propoxyl-1-cyclohexene-1-carboxylic acid
作者:Willard Lew、Matthew A. Williams、Dirk B. Mendel、Paul A. Escarpe、Choung U. Kim
DOI:10.1016/s0960-894x(97)00332-6
日期:1997.7
The importance of the oxygen atom in the C-3 ether side chain of a carbocyclic influenza neuraminidase inhibitor 3 was investigated by replacement of the C-3 ether oxygen atom of 3 with either a sulfur atom (compound 4) or a carbon atom (compound 5). The regio- and stereospecific syntheses of both isoteres are described starting from (-)-quinic acid. (C) 1997 Elsevier Science Ltd.
Role of the CAI-1 Fatty Acid Tail in the <i>Vibrio cholerae</i> Quorum Sensing Response
作者:Lark J. Perez、Wai-Leung Ng、Paul Marano、Karolina Brook、Bonnie L. Bassler、Martin F. Semmelhack
DOI:10.1021/jm300908t
日期:2012.11.26
Quorum sensing is a mechanism of chemical communication among bacteria that enables collective behaviors. In V. cholerae, the etiological agent of the disease cholera, quorum sensing controls group behaviors including virulence factor production and biofilm formation. The major V. cholerae quorum-sensing system consists of the extracellular signal molecule called CAI-1 and its cognate membrane bound receptor called CqsS. Here, the ligand binding activity of CqsS is probed with structural analogues of the natural signal. Enabled by our discovery of a structurally simplified analogue of CAI-1, we prepared and analyzed a focused library. The molecules were designed to probe the effects of conformational and structural changes along the length of the fatty acid tail of CAI-1. Our results, combined with pharmacophore modeling, suggest a molecular basis for signal molecule recognition and receptor fidelity with respect to the fatty acid tail portion of CAI-1. These efforts provide novel probes to enhance discovery of antivirulence agents for the treatment of V. cholerae.
PANSEGRAU, PAUL D.;RIEKER, WILLIAM F.;MEYERS, A. I., J. AMER. CHEM. SOC., 110,(1988) N 21, C. 7178-7184
作者:PANSEGRAU, PAUL D.、RIEKER, WILLIAM F.、MEYERS, A. I.
DOI:——
日期:——
NEW INTERNAL AND EXTERNAL DONOR COMPOUNDS FOR OLEFIN POLYMERIZATION CATALYSTS