Carbon dioxide can be used as a convenient carbonylating agent in the synthesis of 2-oxazolidinones, 2-oxazinones, and cyclic ureas. The transient carbamate anion generated by treating a primary or secondary amine group in basic media can be activated with phosphorylatingagents such as Diphenylphosphoryl azide (DPPA) and Diphenyl chlorophosphate (DPPCl) but also with other types of electrophiles such
Selective Catalytic Oxidative Carbonylation of Amino Alcohols to Ureas
作者:Delmy J. Díaz、Keisha-Gay Hylton、Lisa McElwee-White
DOI:10.1021/jo0521908
日期:2006.1.1
Amino alcohols undergo W(CO)6-catalyzed oxidativecarbonylation to the corresponding hydroxyalkylureas without protection of the hydroxyl group. Selected examples of 1,2-, 1,3-, 1,4-, and 1,5-amino alcohols were converted to the ureas in good to excellent yields, with only small amounts of the cyclic carbamates being formed. In contrast, the phosgene derivatives CDI and DMDTC undergo stoichiometric
NOVEL PYRAZINE COMPOUNDS FOR THE TREATMENT OF INFECTIOUS DISEASES
申请人:Hoffmann-La Roche Inc.
公开号:US20160237090A1
公开(公告)日:2016-08-18
The present invention relates to compounds of the formula (I),
or pharmaceutically acceptable salts, enantiomer or diastereomer thereof, wherein R
1
to R
4
are as described above. The compounds may be useful for the treatment or prophylaxis of hepatitis B virus infection.
The present invention relates to compounds of the formula (I),
or pharmaceutically acceptable salts, enantiomer or diastereomer thereof, wherein R1 to R4 are as described above. The compounds may be useful for the treatment or prophylaxis of hepatitis B virus infection.