4-Substituted-1, 4-dihydropyridines (1, 4-DHPs) exhibit wide variety of biological activities such as cardiovascular, vasodilator, bronchodilator, antiatherosclerotic, antitumour, antidiabetic, hepatoprotective, geroprotective, antituberculosis, calcium channel blocker activity, and NO releasing activity [1-5]. DHP based drugs such as nifedipine, nicardipine, amlodipine and many others are used for the treatment of hypertension and cerebrocrast; ...