Asymmetric synthesis of α-arylglycinols via additions of lithium methyl p-tolyl sulfoxide to N-(PMP)arylaldimines followed by “non oxidative” Pummerer reaction
作者:Pierfrancesco Bravo、Silvia Capelli、Marcello Crucianelli、Maurizia Guidetti、Andrey L Markovsky、Stefano V Meille、Vadim A Soloshonok、Alexander E Sorochinsky、Fiorenza Viani、Matteo Zanda
DOI:10.1016/s0040-4020(99)00064-2
日期:1999.3
favor the opposite stereochemical outcome. On the other hand, the reactions run under thermodynamically controlled conditions (0 °C) afforded equimolar mixtures of the diastereomeric products regardless of the pattern of substitution on the starting imines. Enantiopure α-arylglycinols were readily synthesized by “non-oxidative” Pummerer rearrangement of diastereomerically pure β-aryl-β-N-(acyl)aminoalkyl
Effect of Aryl Ring Fluorination on the Antibacterial Properties of C4 Aryl-Substituted N-Methylthio β-Lactams
作者:Timothy E Long、Edward Turos、Monika I Konaklieva、Allison L Blum、Amal Amry、Ejae A Baker、Lita S Suwandi、Melodie D McCain、Miti F Rahman、Sonja Dickey、Daniel V Lim
DOI:10.1016/s0968-0896(03)00037-3
日期:2003.4
4-Aryl-substituted N-thiolated beta-lactams are a new family of antibacterial agents possessing unique structure activity profiles and a mode of action. Unlike traditional beta-lactam antibiotics, which require highly polar enzyme-binding groups, these lactams bear hydrophobic groups on their side chains. In this study, we examine the effect that increasing hydrophobicity, through fluorine substitution in the C-4 aryl ring, has on the antibacterial properties. (C) 2003 Elsevier Science Ltd. All rights reserved.
Sharma; Saluja, Aarti; Bhaduri, Susmita, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2002, vol. 41, # 9, p. 1964 - 1969
Reductive ring opening of 2-azetidinones promoted by sodium borohydride
作者:Paola Del Buttero、Giorgio Molteni、Maurizio Roncoroni
DOI:10.1016/j.tetlet.2006.01.103
日期:2006.3
Variously substituted 2-azetidinones 3 and 4 were reacted with sodiumborohydride in aqueous isopropanol giving 3-aminopropan-1,2-dioles 5 and 7. Reaction extent was dependent upon the substitution pattern in the 3- and 4-positions of the 2-azetidinone ring and revealed good correlation with carbonyl LUMO energies of starting 3.