C-3 alkylation of oxindole with alcohols by Pt/CeO<sub>2</sub> catalyst in additive-free conditions
作者:Chandan Chaudhari、S. M. A. Hakim Siddiki、Kenichi Kon、Atsuko Tomita、Yutaka Tai、Ken-ichi Shimizu
DOI:10.1039/c3cy00911d
日期:——
In a series of transition metal-loaded CeO2 catalysts and Pt-loaded catalysts on various supports, Pt-loaded CeO2 shows the highest activity for the selectiveC-3alkylation of oxindole with octanol. The catalyst is effective for alkylation of oxindole and N-substituted oxindole with a series of substituted benzyl, linear, hetero-aryl alcohols under additive-free conditions and is recyclable. Our results
The present invention is concerned with new 3,3-disubstituted indol-2-one derivatives of the general Formula (I), wherein R
1
stands for hydrogen, halogen, alkyl having 1-7 carbon atom(s) or sulfonamido; R
2
represents hydrogen or halogen; R
3
denotes hydrogen, alkyl having 1-7 carbon atom(s) optionally carrying an aryl substituent or aryl optionally carrying one or two halogen substituent(s); R
4
stands for alkyl having 1-7 carbon atom(s); R
5
represents a group of the general Formula (II a) or (II b), wherein Q and W each represents nitrogen or CH; R
6
, R
7
and R
8
each stands for hydrogen, halogen, trifluoromethyl, alkyl or alkoxy having 1-7 carbon atom(s), or R
6
and R
7
together represent ethylenedioxy; m is 0, 1, or 2; a is a single, double or triple bond; n is 0, 1 or 2; and pharmaceutically acceptable acid addition salts thereof which are useful in the treatment or prophylaxis of diseases of the central nervous system, the gastrointestinal system and the cardiovascular system.
Raney Nickel-Induced 3-Alkylation of Oxindole with Alcohols and Diols
作者:Balázs Volk、Tibor Mezei、Gyula Simig
DOI:10.1055/s-2002-23544
日期:——
New reaction conditions are described, which turn Wenkert’s synthesis of 3-alkyloxindoles (Raney nickel-induced alkylation of oxindole with alcohols) into a reproducible and highly efficient synthetic tool. The method is also extended to the preparation of 3-(Ï-hydroxyalkyl)oxindoles.
contain a 1,3-dihydro-2 H-indol-2-one (oxindole) skeleton. The binding of these compounds to the 5-HT 7 and 5-HT 1A receptors was measured. Despite the structural similarity of these two serotonin receptor subtypes, several derivatives exhibited a high selectivity to the 5-HT 7 receptor. According to the structure-activity relationship observations, compounds unsubstituted at the oxindole nitrogen atom