The first iodine improved 1,3-dipolar cycloaddition: facile and novel synthesis of 2-substituted benzo[f]isoindole-4,9-diones
作者:Huan-Ming Huang、Jian-Rong Gao、Li-Fen Hou、Jian-Hong Jia、Liang Han、Qing Ye、Yu-Jin Li
DOI:10.1016/j.tet.2013.08.029
日期:2013.10
The first novel protocol of the synthesis of 2-substituted benzo[f]isoindole-4,9-dione framework via the one-pot, 1,3-dipolarcycloaddition of quinones, paraformaldehyde and N-substituted amino ester hydrochlorides in the present of iodine at refluxing acetonitrile was reported. All these reactions proceed with good to excellent yields. The promising results obtained 1,3-dipolarcycloaddition will
Aliphatic amino carboxylic and amino phosphonic acids, amino nitriles and amino tetrazoles as cellular rescue agents
申请人:Dyck E. Lillian
公开号:US20050159393A1
公开(公告)日:2005-07-21
Novel compounds of the formula I are described:
wherein:
R
1
=(CH
2
)
m
CH
3
where m is 0 or an integer in the range from 1 to 16, or an alkenyl, alkynyl, alkoxy, alkylthio, or alkyl sulfinyl group having from 2 to 17 carbon atoms,
R
2
=H, CH
3
or CH
2
CH
3
R
3
=H or CH
3
R
4
=H or CH
3
R
5
=lower alkyl having from 1 to 5 carbon atoms n is an integer in the range from 1 to 3,
and X is carboxyl (COOH) or carbalkoxy (COOR
5
), cyano (C≡N), phosphonic acid (PO
3
H
2
), phosphonate ester (PO
3
[R
5
]
2
) or 5-tetrazole, and pharmaceutically acceptable salts thereof. Preferably, the compounds are optically pure enantiomers of the R- or S-configuration in which R
3
=R
4
=R
5
=H, R
2
=CH
3
and R
1
is a saturated aliphatic chain of one to five carbon atoms. The compounds are useful as cellular rescue agents.