1. Patent info
http://www.wipo.int/pctdb/en/wo.jsp?IA=IN2007000546 (may search for more relevant patents)
2. Detailed procedures for synthesis
http://pubs.acs.org.libproxy1.nus.edu.sg/doi/full/10.1021/op700110b
http://www.sciencedirect.com.libproxy1.nus.edu.sg/science?_ob=ArticleURL&_udi=B6TF8-4J72YST-4&_user=111989&_coverDate=06%2F01%2F2006&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000008700&_version=1&_urlVersion=0&_userid=111989&md5=a6b7618a97ef4cbaf34afe7ca6f7b43a
