Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Jaroslav Zajíček"'
Publikováno v:
Chemical communications (Cambridge, England). 53(95)
The repeating isoprene unit is a fundamental biosynthetic motif. Repetitive structure presents challenges both for synthesis and for structural characterization. In this synthesis of the (Z8, E2, ω)-undecaprenol of prokaryotic glycobiology, we exemp
Publikováno v:
Nucleosides and Nucleotides. 16:129-144
The title compound was prepared by the isocyanate procedure and the tri-methylsilyl method. The measurement of 1H NMR spectrum of 6-methyl-5-azacytidine (1) revealed a preference of γt (46%) rotamer around C(5′)-C(4′) bond, a predominance of N c
Publikováno v:
ChemInform. 22
Publikováno v:
ChemInform. 22
Publikováno v:
ChemInform. 22
Publikováno v:
ChemInform. 22
Publikováno v:
ChemInform. 28
Publikováno v:
Collection of Czechoslovak Chemical Communications. 56:1340-1347
6β,17-Dihydroxy-3α,5-cyclo-5α-pregnan-20-one (VII) and 17-hydroxy-6β-methoxy-3α,5-cyclo-5α-pregnan-20-one (IX) were hydroxylated into the position 11α using Rhizopus nigricans fungi culture, and then selectively converted into haptene XIII for
Publikováno v:
Collection of Czechoslovak Chemical Communications. 56:1948-1956
Preparation of 5’-O-(4,4’-dimethoxytrityl)-2’-O-tert-butyldimethylsilyl (tBDMSi) derivatives of N2-dimethylaminomethyleneguanosine (IIIa) and N6-dimethylaminomethyleneadenosine (IVa) and their 3’-H-phosphonates (IIIb, IVb) is described. The c
A-homo-B,19-dinorandrostanes from 6β-methanesulfonyloxy-5-methyl-19-nor-5β-androst-9-ene derivatives
Publikováno v:
Collection of Czechoslovak Chemical Communications. 56:1070-1086
6β-Methanesulfonyloxy derivatives of 5-methyl-19-nor-5β-androst-9-enes with different oxygen functionalities in positions 3β and 17 ( compounds IX and XVII) were converted to 4a-methyleno-A-homo-B,19-dinor-5β-androst-9-ene derivatives (compounds