Saccharin sulfonic acid catalyzed N-Boc protection of amines and formation of tert-butyl ethers from alcohols
作者:F. Shirini、M. A. Zolfigol、M. Abedini
DOI:10.1007/bf03246047
日期:2010.9
(SaSA), as a stable reagent is easily prepared by the reaction of saccharin with neat chlorosulfonic acid at room temperature. This compound is able to catalyze conversion of amines to their corresponding N-Boc protected amines with (Boc)2O. Alcohols were also converted to their corresponding tert-butyl ethers. All reactions took place under mild conditions giving the desired products in good to high
This invention relates to novel compounds having the structural diagram (I) and to their pharmaceutical compositions and to their methods of use. These novel compounds provide a treatment or prophylaxis of cancer.
A compound of the formula (I):
wherein:
A and B together represent an optionally substituted, fused aromatic ring or an optionally substituted, fused cyclohexene ring;
D is selected from:
where Y
1
is selected from CH and N, Y
2
is selected from CH and N, Y
3
is selected from CH, CF and N and Y
4
is selected from CH and N;
where Y
1
is selected from CH and N and Y
2
is selected from CH and N;
where Q is O or S; and
where Q is O or S; and
R
D
is an optionally substituted C
5-20
aryl group, bound to D by a carbon-carbon bond.
METHOD FOR PREPARING NOVEL ANIONIC POLYMERIZATION INITIATOR AND CONJUGATE DIENE SYSTEM COPOLYMER USING SAME
申请人:LG Chem, Ltd.
公开号:EP3095799A1
公开(公告)日:2016-11-23
Disclosed are an anionic polymerization initiator, which is a reaction product of an organometallic compound and a compound including an etheric oxygen atom-containing alkyl group represented by specific Chemical Formula, and a method of preparing a conjugated diene-based copolymer using the same.