Synthesis of 2-arylbenzothiazoles via direct condensation between in situ generated 2-aminothiophenol from disulfide cleavage and carboxylic acids
作者:Felipe L. Coelho、Leandra F. Campo
DOI:10.1016/j.tetlet.2017.04.078
日期:2017.6
In this work we describe a simple and efficient general methodology for 2-arylbenzothiazole preparation employing disulfides and carboxylic acids. The reaction is promoted by tributylphosphine that acts both in disulfide bond cleavage and as activating agent for coupling with carboxylic acids. The reaction scope was studied using bis(2-aminophenyl)disulfide and different carboxylic acids with donor/withdrawing
Fused bicyclic-substituted amines as histamine-3 receptor ligands
申请人:——
公开号:US20040248899A1
公开(公告)日:2004-12-09
Compounds of formula (I)
1
are useful in treating conditions or disorders prevented by or ameliorated by histamine-3 receptor ligands. Also disclosed are pharmaceutical compositions comprising the histamine-3 receptor ligands and methods for using such compounds and compositions.
efficient method for preparing benzothiazolone derivatives was developed by a domino coupling reaction between the disulfide and COS in the present of NaOH. Notably, the C=O of COS was converted into benzothiazolone by carbonylation reaction and the sulfur of COS was transformed into sulfur and sulfide after cleaving the S–S bond undermildconditions. This efficient synthetic methodology could provide
Fluorescence Properties of 5-(5,6-Dimethoxybenzothiazol-2-yl)-2′-deoxyuridine (dbtU) and Oligodeoxyribonucleotides Containing dbtU
作者:Wataru Hirose、Kousuke Sato、Akira Matsuda
DOI:10.1002/ejoc.201100818
日期:2011.11
The photophysical properties of 11 substituted 5‐(benzothiazol‐2‐yl)‐2′‐deoxyuridine derivatives and oligodeoxyribonucleotides (ODNs) containingdbtU are described. The fluorescenceproperties of the ODNs containing 16 combinations of 5′‐XbtU‐3′ and 5′‐btUY‐3′ were compared, and dbtU was found to be a very promising new fluorescent analogue while showing low sensitivity to its microenvironment in DNA