The 1,10-phenanthroline-catalyzedtandemreaction of 2-iodoaniline with isothiocyanate in water is described, which provides an environmentally benign, efficient and simple route for the preparation of 2-aminobenzothiazoles. The present tandem process shows broad substrate scope in the absence of transition metals and phase-transfer catalysts.
The present invention relates to compounds of formula (I)
1
wherein R
1
, R
2
, R
3°
R
3a
and R
3b
are as provided in the description, and pharmaceutically acceptable salts thereof, for use in the treatment and/or prophylaxis of diseases which are associated with the modulation of CB1 receptors such as obesity.
Copper/<i>N,N,N′,N′</i>-Tetramethylethylenediamine-Catalyzed Synthesis of<i>N</i>-Substituted Benzoheterocycles<i>via</i>CS Cross- Coupling at Ambient Temperature in Water
作者:Na Zhao、Liang Liu、Fei Wang、Jia Li、Wu Zhang
DOI:10.1002/adsc.201400043
日期:2014.8.11
AbstractCopper/N,N,N′,N′‐tetramethylethylenediamine (Cu/TMEDA)‐catalyzed ambient temperature tandem reactions of isothiocyanates with 2‐iodophenols or 2‐iodoanilines in water without the protection of an inert atmosphere are described, which provide a simple, rapid, environmental method for the synthesis of a variety of 2‐iminobenzo‐1, 3‐ oxathioles and 2‐aminobenzothiazoles in good yields. More important, the present reaction process needs only low amounts of copper catalyst (<1 mol%) and can yield the products on a gram scale.magnified image
2-AMINOBENZOTHIAZOLES AS CB1 RECEPTOR INVERSE AGONISTS