Process for preparation of N-1 protected N ring nitrogen containing cyclic polyamines and products thereof
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United States of America Patent
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Dec 3, 2002
Grant Date -
May 16, 2002
app pub date -
Sep 28, 2001
filing date -
Sep 29, 2000
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Abstract
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.
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