Rh(III)-Catalyzed Trifluoromethylthiolation of Indoles via C–H Activation
作者:Qiang Wang、Fang Xie、Xingwei Li
DOI:10.1021/acs.joc.5b00940
日期:2015.8.21
Cp*Rh(III) complexes have been applied as efficient catalysts for the C–Hactivation and trifluoromethylthiolation of indoles functionalized with a heterocycle. With N-trifluoromethylthiosaccharin being an electrophilic SCF3 reagent, this C–S coupling occurred selectively at the 2-position with good functional group tolerance.
This invention offers isoxazole derivatives represented by the following formula (I)
in which R
1
and R
2
each stands for hydrogen, lower alkyl, amino and the like; R
3
stands for substituted or unsubstituted aryl or hetero aryl; R
4
stands for hydrogen or lower alkyl; R
5
stands for substituted or unsubstituted phenyl, furyl and the like; and Y stands for —CH
2
—, —CO—, —O—, —NH— and the like,
or pharmaceutically acceptable salts thereof which exhibit excellent p38MAPkinase-inhibiting action with reduced side-effects, and are useful for treating such diseases as chronic rheumatoid arthritis, ulcerative colitis and the like.