Structure–activity relationships study of 6-chloro-4-(2-chlorophenyl)-3-(2-hydroxyethyl) quinolin-2(1H)-one derivatives as novel non-nucleoside anti-hepatitis B virus agents
A series of novel 6-chloro-4-(2-chlorophenyl)-3-(2-hydroxyethyl) quinolin-2(1H)-onederivatives were synthesized and evaluated for anti-hepatitis B virus (anti-HBV) activities in vitro to explore their structure–activity relationships (SARs). Most of the synthesized compounds possessed potent anti-HBV activity, of which the promising compound 44 exhibited significantly inhibitory potency against the
Short path syntheses of α-diozonides by sequential ozonolyses of acetylenes and O-methyl oximes
作者:Yuxiang Dong、Karl Griesbaum、Kevin J. McCullough
DOI:10.1039/a700989e
日期:——
Ozonolyses of but-2-yne 1 in the presence of added carbonyl compounds
3 afford α-oxo ozonides 4. Subsequent cycloadditions
between ozonides 4 and cyclohexanone oxide 6, generated in situ
by ozonolysis of O-methylcyclohexanone oxime, yield in turn
α-diozonides 7 into which have been incorporated the
carbon skeletons of all three substrates involved. Ozonolyses of
acyloxy-substituted but-2-ynes 9 yield the corresponding bicyclic
α-oxo ozonides 11 which subsequently participate in
analogous cycloadditions with 6 to produce the corresponding
α-diozonides 12. X-Ray crystallographic analysis of the
crystalline diozonide 12a shows that it has been formed exclusively by
exo-addition of 6 to 11a.
Transsialidase fromTrypanosoma cruzi for Regio- and Stereoselective Synthesis of N-Acyl-Modified Sialylated Oligosaccharides and Measurement of Transfer Rates
Recombinant transsialidase from Trypanosoma cruzi (TcTS) was used for the sialylation with natural and non-natural derivatives of neuraminic acid. Neu5Ac-alpha(2-->3)-Gal-beta(1-->6)-Glc-alphaOMe was prepared in 80 % yield. Correspondingly, the modified trisaccharide derivatives Neu5Prop-alpha(2-->3)-Gal-beta(1-->6)-Glc-alphaOMe (32 %) and Neu5Gc-alpha(2-->3)-Gal-beta(1-->6)-Glc-alphaOMe (Prop=propanoyl
Synthesis of Chrysogine, a Metabolite of Penicillium chrysogenum and some related 2-substituted 4-(3H)-Quinazolinones
作者:Jan Bergman、Anna Brynolf
DOI:10.1016/s0040-4020(01)86694-1
日期:1990.1
Syntheses of both enantiomers of chrysogine, 2-(α-hydroxyethyl)-4(3H)-quinazolinone, 1 from 2-ammobenzamide are reported. Thus reaction of 2-aminobenzamide and optically active α-acetoxypropionyl chloride gave 9, which upon saponification and cyclization induced by aqueous sodium carbonate at room temperature gave chrysogine. The enantiomeric purity of 1 was determined by NMR. Inversion of (-)-(S)-1