OsO4⋅Streptavidin: A Tunable Hybrid Catalyst for the Enantioselective cis-Dihydroxylation of Olefins
作者:Valentin Köhler、Jincheng Mao、Tillmann Heinisch、Anca Pordea、Alessia Sardo、Yvonne M. Wilson、Livia Knörr、Marc Creus、Jean-Christophe Prost、Tilman Schirmer、Thomas R. Ward
DOI:10.1002/anie.201103632
日期:2011.11.11
Taking control: Selective catalysts for olefindihydroxylation have been generated by the combination of apo‐streptavidin and OsO4. Site‐directed mutagenesis allows improvement of enantioselectivity and even inversion of enantiopreference in certain cases. Notably allyl phenyl sulfide and cis‐β‐methylstyrene were converted with unprecedented enantiomeric excess.
Asymmetric dihydroxylation of olefins containing sulfur: Chemoselective oxidation of CC double bonds in the presence of sulfides, 1,3-dithianes, and disulfides
作者:Patrick J. Walsh、Pui Tong Ho、S.Bruce King、K.Barry Sharpless
DOI:10.1016/s0040-4039(00)77045-6
日期:1994.7
tetroxide catalyzed oxidation of sulfide containing olefins in the presence of the chiral ligands (DHQD)2PHAL and (DHQ)2PHAL resulted in the chemoselective oxidation of the CC double bond rather than oxidation at sulfur. The enantioselectivity is dependent on the substitution pattern of the olefin and ranges from 61–98%. The AD can be performed in the presence of the disulfide and 1,3-dithiane functional
Osmium-Catalyzed Dihydroxylation of Olefins Using Dioxygen or Air as the Terminal Oxidant
作者:Christian Döbler、Gerald M. Mehltretter、Uta Sundermeier、Matthias Beller
DOI:10.1021/ja000802u
日期:2000.10.1
The osmium-catalyzed dihydroxylation of various olefinsusing molecular oxygen or air as the stoichiometric oxidant is reported. Aromatic olefins yield the corresponding diols in good to excellent chemoselectivities under optimized pH conditions (pH = 10.4−12.0). Air can be used under moderate pressures (3−9 bar) instead of dioxygen as the reoxidant. By increasing the oxygen content of the solution
4-oxo-4,7-dihydrothieno[2,3-b]pyridine-5-carboxamides as antiviral agents
申请人:Schnute Edward Mark
公开号:US20050004161A1
公开(公告)日:2005-01-06
The invention provides a compound of formula I:
wherein A, B, R
1
, R
2
, R
3
, and R
4
are as defined in the specification. The compounds of the present invention are useful for treating viral infections, in particular a herpesviral infection.
The phenyl glycidyl ether derivatives have been kinetically resolved with the growing cells of Bacillus alcalophilus MTCC10234 yielding (S)-epoxides with up to >99% ee and (R)-diols with up to 89% ee. The enantiomeric ratio (E) of up to 67 has been obtained for biohydrolysis process. The effect of different substituents of phenyl glycidyl ether on the biocatalytic efficiency of B. alcalophilus MTCC10234