Synthesis of pyrrolidines using an α-cyanoaminosilane as an azomethine ylide equivalent
作者:Albert Padwa、Yon-Yih Chen
DOI:10.1016/s0040-4039(00)86009-8
日期:1983.1
The potential of α-cyanoaminosilane () to act as an azomethineylideequivalent is illustrated by its treatment with silver fluoride in the presence of electron deficient olefins to give substituted pyrrolidines in high yield.
Disubstituted 7-pyrrolidinoquinoline- and -naphthyridine-3-carboxylic acids as antibacterial agents are described as well as methods for their manufacture, formulation, and use in treating bacterial infections.
A Practical and Efficient Synthesis of (3<i>R</i>,4<i>S</i>)-1-Benzyl-4-phenylpyrrolidine-3-carboxylic acid via an Aziridinium Ion Intermediate
作者:Atsushi Ohigashi、Takashi Kikuchi、Shunsuke Goto
DOI:10.1021/op900230r
日期:2010.1.15
utilizing a stereospecific and regioselective chlorination of in situ generated aziridiniumion, followed by a nitrile anion cyclization. Starting from commercially available (R)-styrene oxide and 3-(benzylamino)propionitrile, the four-step synthesis features a through process without purification of intermediates until isolation of crystalline 1. The robust, chromatography-free and reproducible synthesis
Thiourea-Mediated Stereospecific Deoxygenation of Cyanoepoxides to Access Highly Diastereopure Alkenyl Nitriles
作者:Yujie Zhang、Shukui Shi、Zhanhui Yang
DOI:10.1021/acs.joc.3c02869
日期:2024.2.16
A practical and efficient protocol for synthesis of >99% diastereopure Z- and E-alkenyl nitriles is developed, through tetramethylthiourea-mediated stereospecificdeoxygenation of respective cis- and trans-cyanoepoxides in ethanol. The desired products are obtained in excellent yields.
Synthesis and antimicrobial evaluation of a series of 7-[3-amino (or aminomethyl)-4-aryl (or cyclopropyl)-1-pyrrolidinyl]-4-quinolone and -1,8-naphthyridone-3-carboxylic acids
作者:Ruth A. Bucsh、John M. Domagala、Edgardo Laborde、Josephine C. Sesnie
DOI:10.1021/jm00078a002
日期:1993.12
A series of 6-fluoroquinolone- and 6-fluoro-1,8-naphthyridone-3-carboxylic acids possessing a [3-amino (or aminomethyl)-4-aryl (or cyclopropyl)-1-pyrrolidinyl] group at C-7 were synthesized and evaluated for their antimicrobial activity. The effect of the relative stereochemistry of the pyrrolidinyl substituents, as well as the presence of different functional groups on the 4-aryl (or cyclopropyl) moiety, was investigated in conjunction with their attachment to several quinolone or naphthyridone nuclei. In general, the incorporation of substituents on the aryl (or cyclopropyl) ring decreased in vitro and in vivo activity, regardless of the nature and relative position of the substituent. Bulky, lipophilic groups and substitution at the 2- and 3-position of the aromatic ring were particularly deleterious. Within a limited subset of derivatives, cis substitution of the pyrrolidine ring was less favorable than trans substitution. The majority of these effects were more apparent against the Enterobacteriaceae than against any other Gram-negative or Gram-positive organism and could be associated with negative interactions related to permeability or transport factors.