Historically we have been interested in developing simple procedures for the partial protection of polyamines using stoichiometric amounts of reagents and avoiding the use of chromatographic purification. We previously described the use of alkyl phenyl carbonates for the monoprotection of diamines and diprotection of triamines in fair to good yields. 1, 2 Alkyl phenyl carbonates are easy to synthesize on a large scale and have a long shelf-life. 1 ...
