Synthesis of thio-heterocyclic analogues from Baylis–Hillman bromides as potent cyclooxygenase-2 inhibitors
摘要:
A series of thio-substituted pyrimidine, benzoxazole, benzothiazole and triazole analogues were synthesized from Baylis-Hillman bromides in a clean and efficient way. The synthesized twenty new compounds were subjected to in vitro COX-1 and COX-2 inhibitory activity. Majority of compounds found to be highly selective COX-2 inhibitor. Seven compounds (16e, 16f, 16k, 16l, 16m, 16r and 16s) displayed anti-inflammatory activity at micromolar concentrations with IC50 values for COX-2 inhibition ranging from 2.93 to 5.34 mu M compared to reference drug whose IC50 is 2.66 mu M. All these seven compounds had very little COX-1 inhibition property and thus are suitable candidates for anti-inflammatory drugs with less gastrointestinal side effect. (c) 2014 Elsevier Ltd. All rights reserved.
An expedient stereoselective synthesis of (Z)- and (E)-allyl iodides from Baylis–Hillman adducts along with selective iodination of benzylic alcohols using the polymethylhydrosiloxane–iodine system
A stereoselective method has been developed for the synthesis of (Z)- and (E)-allyl iodides from Baylis–Hillman adducts using polymethylhydrosiloxane (PMHS) and iodine in chloroform at room temperature. In addition, the reagent system has been utilized for the iodination of benzylic alcohols selectively.
INDOLIZINONE BASED DERIVATIVES AS POTENTIAL PHOSPHODIESTERASE 3 (PDE3) INHIBITORS AND A PROCESS FOR THE PREPARATION THEREOF
申请人:COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH
公开号:US20140296530A1
公开(公告)日:2014-10-02
The present invention provides compounds of general formula A useful as potential phosphodiesterase3 (PDE3) inhibitory agents and a process for the preparation thereof. The derivatives of formula A can be employed as therapeutics in human and veterinary medicine, where they can be used, for example, for the treatment and prophylaxis of the following diseases: heart failure, dilated cardiomyopathy, platelet inhibitors, cancer and obstructive pulmonary diseases.
Treatment of Baylis–Hillman adducts 1 with bromo(dimethyl)sulfonium bromide, Br(Me2)S+Br−, in MeCN was found to stereoselectively afford (Z)- and (E)-allyl bromides 2. The reaction is rapid at room temperature, high-yielding, and highly stereoselective.
Treatment of Baylis–Hillman adducts with Et3SiH/I2 in CHCl3 at room temperature afforded the (Z)- and (E)-allyl iodides in stereoselective manner. The products are formed in excellent yields within 5 min. The method has successfully been utilized for synthesis of natural bioactive fatty acid amide, semiplenamide D.