Di-tert-butyl Dicarbonate and 4-(Dimethylamino)pyridine Revisited. Their Reactions with Amines and Alcohols1
摘要:
The reaction of BOC2O in the presence and absence of DMAP was examined with some amines, alcohols, diols, amino alcohols, and aminothiols. Often, unusual products were observed depending on the ratio of reagents, reaction time, polarity of solvent, pK(a) of alcohols, or type of amine (primary or secondary). In reactions of aliphatic alcohols with BOC2O/DMAP, we isolated for the first time carbonic-carbonic anhydride intermediates; this helps explain the formation of symmetrical carbonates in addition to the O-BOC products. In the case of secondary amines, we succeeded to isolate unstable carbamic-carbonic anhydride intermediates that in the presence of DMAP led to the final N-BOC product. The effect of N-methylimidazole in place of DMAP was also examined.
Novel acyclic nucleoside phosphonate derivatives, salts thereof and process for the preparation of the same
申请人:CHO Dong-Gyu
公开号:US20100004440A1
公开(公告)日:2010-01-07
The present invention relates to an acyclic nucleoside phosphonate derivative which is useful as an antiviral agent (particularly, against hepatitis B virus), pharmaceutically acceptable salts, stereoisomers, and a process for the preparation thereof.
Synthesis and kinetics of decomposition of di-tert-butyl tricarbonate, di-tert-butyl dithioltricarbonate, and the related dicarbonates
作者:Christopher S. Dean、D. Stanley Tarbell、A. W. Friederang
DOI:10.1021/jo00835a045
日期:1970.10
SUBSTITUTED CYCLIC PYRROLIDINE DERIVATIVES
申请人:Qiu Yao-Ling
公开号:US20090324544A1
公开(公告)日:2009-12-31
The present invention discloses compounds of Formula (I), or pharmaceutically acceptable salts, esters, or prodrugs thereof:
which inhibit RNA-containing virus, particularly the hepatitis C virus (HCV). Consequently, the compounds of the present invention interfere with the life cycle of the hepatitis C virus and are also useful as antiviral agents. The present invention further relates to pharmaceutical compositions comprising the aforementioned compounds for administration to a subject suffering from HCV infection. The invention also relates to methods of treating an HCV infection in a subject by administering a pharmaceutical composition comprising the compounds of the present invention. The present invention relates to novel antiviral compounds represented herein above, pharmaceutical compositions comprising such compounds, and methods for the treatment or prophylaxis of viral (particularly HCV) infection in a subject in need of such therapy with said compounds.
CARBACEPHEM BETA-LACTAM ANTIBIOTICS
申请人:Wagman Allan S.
公开号:US20100267686A1
公开(公告)日:2010-10-21
Carbacephem β-lactam antibiotics having the following chemical structures (I) and (II) are disclosed:
including stereoisomers, pharmaceutically acceptable salts, esters and prodrugs thereof, wherein Ar
2
, R
1
, R
2
and R
3
are as defined herein. The compounds are useful for the treatment of bacterial infections, in particular those caused by methicillin-resistant
Staphylococcus
spp.