I am searching for some good sites where I could directly browse reactions for synthesis of desired molecules. I Know few of them
FOR DRUG SYNTHESIS
One site for synthesis of drugs is www.drugsyn.org where one can browse reactions alphabitacilly from its search page.
FOR ORGANIC CHEMISTRY
For organic chemistry www.organic-chemistry.org is best.
FOR SYNTHESIS OF NATURAL PRODUCTS
For synthesis of natural products www.synarchive.com is the best.
Kindly let me know few more sites if some one has came across.