Drug Synthesis:- A field of organic chemistry
www.drugsyn.org
There are few more sites about organic chemistry. The one of which is www.drugsyn.org which has been started in 2011. The site gives schematic representation for the synthesis of many drugs which can be browsed through their search page alphabetically. This molecules are the one which has been reported in the literature.
One more site is www.synarchive.com which gives description about synthesis of natural products reported in literature. Even synthesis involving more then 20 steps has been summerized.