New C-(N,N-dialkylamino)phosphaalkenes were synthesized by the reaction of phenylphosphine with amidacetals. Such compounds may also be synthesized by the reaction of bis(trimethylsilyl)phenylphosphine with amidacetals.
Aminopyridine Carbamic Acid Esters: Synthesis and Potential as Acetylcholinesterase Inhibitors and Acetylcholine Releasers
作者:Gregory M. Shutske、John D. Tomer、Kevin J. Kapples、Nicholas J. Hrib、John G. Jurcak、Gina M. Bores、Francis P. Huger、Wayne Petko、Craig P. Smith
DOI:10.1002/jps.2600810419
日期:1992.4
intermediate in the synthesis of 2b, demonstrated surprisingly good cholinesterase inhibition (IC50 was 9.4 microM) but showed no activity as a release. A precursor to 7a, N-(3-hydroxy-4-pyridyl)-N',N'-dimethylformamidine (6a), showed some activity in release but was not an esterase inhibitor, whereas the precursor to 6a, 4-amino-3-pyridinol (5a), was a potent releaser. A new synthesis of 5a, based on
Rates of reaction of seven N,N-dialkylformamideacetals R12N–CH(OR2)2 with a series of anilinessubstituted on the phenyl ring have been measured in benzene, methanol, chloroform, and tetrahydrofuran by use of a g.l.c. method. In each case studied reaction is irreversible and obeys a second-order kinetic equation. Reactionrates correlate with Hammett σ constants for substituents on the phenyl ring
6-Amidinopenicillanic acid derivatives wherein one of the nitrogen atoms of the amidino group is part of a heterocyclic ring having on a side chain an unsubstituted heterocyclic ring containing 2 to 3 nitrogen atoms, and being useful as an antibiotic.
Synthesis and antiviral activity of prodrugs of the nucleoside 1-[2′,3′-Dideoxy-3′-C-(hydroxymethyl)-β-?-erythropentofuranosyl] cytosine
作者:S Mauldin
DOI:10.1016/s0968-0896(98)00020-0
日期:1998.5
The synthesis and antiviral evaluation of 21 prodrugs of 1-[2',3'-dideoxy-3'-C-(hydroxymethyl)-beta-D-erythropentofuranosyl ] cytosine 1 is reported. Cytosine N4-imine analogues were prepared by condensation of 1 with selected formamide dimethyl acetals. Amino acid substituted prodrugs were prepared from 1 or imine prodrug 2 by coupling with either N-tert-butoxycarbonyl (t-Boc)-L-valine or N-t-Boc-L-
The hydrolysis of mecillinam in aqueoussolution (37 degrees) was studied at pH 2-10. The degradation products observed by TLC and NMR were identified and quantified. Several of these compounds were synthesized. Mecillinam and the key degradation product, (6R)-6-formamidopenicillanic acid, underwent reversible 6-epimerization in basic solution. Some of the thiazolidine derivatives formed epimerized