Process for preparation of N-1 protected N ring nitrogen containing cyclic polyamines and products thereof
申请人:——
公开号:US20020058807A1
公开(公告)日:2002-05-16
Cyclic polyamines containing N nitrogens on the ring are protected with high yields in a N-1 manner, e.g. all protected but one amino group, by using certain fluoro-containing agents that offer easy deprotection. Preferably, a new process for preparing 1,1′-[1,4-phenylenebis (methylene)]-bis1,4,8,11-tetraazacyclotetradecane is disclosed.