High regioselectivity in electrochemical α-methoxylation of N-protected cyclic amines
摘要:
N-Protecting groups of alpha-substituted cyclic amines strongly affected the regioselectivity in electrochemical methoxylation of these compounds. Namely, N-acyl derivatives were transformed into alpha'-methoxylated compounds, while N-cyano derivatives changed into alpha-methoxylated derivatives. Furthermore, Lewis acid catalyzed nucleophilic substitution of the alpha-methoxylated compounds protected with cyano group afforded alpha,alpha-disubstituted cyclic amines. (c) 2008 Elsevier Ltd. All rights reserved.
p38 MAP kinase inhibitors and methods for using the same
申请人:Arora Nidhi
公开号:US20070054915A1
公开(公告)日:2007-03-08
Compounds of formula
1
a
or
1
b:
wherein A, W, X, Y, R
1
, R
2
, R
3
and R
4
are as defined herein. Also disclosed are methods of making the compounds and methods of using the compounds for treatment of p
38
MAP kinase-mediated diseases.
Reactions of carbamyl radicals: intramolecular hydrogen abstraction reactions
作者:Patrick F. Dicks、Stephen A. Glover、André Goosen、Cedric W. McCleand
DOI:10.1016/s0040-4020(01)90030-4
日期:1987.1
to intramolecularhydrogenabstraction. Methyl N-(ω-phenylalkyl) carbanyl radicals and methyl N-pentylcarbamyi radicals readily abstract hydrogen through a six membered transition state or a seven membered transition state if the hydrogen is beniylic. The selectivities are interpreted in terms of the electrophilicity of the radical and the stereo-electronic requirements of hydrogenabstraction reactions
Process for preparing substituted 5-amino-pyrazolo-[4,3-e]-1,2,4-triazolo-[1,5-c]-pyrimidine
申请人:Kuo Shen-Chun
公开号:US20050090492A1
公开(公告)日:2005-04-28
A process for preparing substituted 5-amino-pyrazolo[4,3-e]-1,2,4-triazolo-[1,5-c]pyrimidine compounds having an aminoalkyl substituent at the 7-position is disclosed, wherein the pyrimidine ring is cyclized using a cyanating agent.
Ring contraction of N-chlorolactams, a novel rearrangement
作者:Alexandre Drouin、Jean Lessard
DOI:10.1016/j.tetlet.2006.04.024
日期:2006.6
Upon photolysis in methylene chloride at −78 °C, different N-chlorolactams underwent a novelringcontraction to the corresponding carbamoyl chlorides, which were converted to the methyl carbamates. The rearrangement is 100% stereoselective, occurring with retention of configuration at the migrating carbon center. The yields of isolated carbamates ranged from 40% to 57%, the other product being the
The invention provides compounds of formula (I):
wherein the variables are defined in the specification, or a pharmaceutically-acceptable salt thereof, that are inhibitors of replication of the hepatitis C virus. The invention also provides pharmaceutical compositions comprising such compounds, methods of using such compounds to treat hepatitis C viral infections, and processes and intermediates useful for preparing such compounds.