Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 77, Issue 20, Pages 8968-8979Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo301349t
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A simple modification of our recently published protection scheme for carboxylic acids as amides resulted in a new protecting group with significantly improved properties. It requires shorter reaction times for deprotection and allows us to replace Cu(OTf)(2) by CuCl2, indicating at the same time the importance of the nature of the anion of the Cu2+ source. Since the new scheme fulfills all criteria required for an ideal protection group it should find widespread application in synthetic organic chemistry.
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