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Reexamination of sodium-liquid ammonia reduction in the peptide chemistry.

Authors
Type
Published Article
Journal
International journal of peptide & protein research
0367-8377
Publisher
Wiley Blackwell (Blackwell Publishing)
Publication Date
Volume
22
Issue
1
Pages
92–109
Identifiers
PMID: 6885253
Source
Medline

Abstract

Sodium-liquid ammonia reduction has been used for over 50 years for removal of benzyl-type protecting groups in peptide chemistry. Up until now a definitely blue end-point has generally been accepted for detection of the completion of reaction. Systematic investigation with model compounds has revealed that this is not only unnecessary for the complete removal of the protecting groups but also that the application of sodium in excess results in many undesired transformations which can simply be suppressed or even eliminated by optimizing the sodium consumption. Cleavage of tert.-butyloxycarbonyl group and N-C alpha bond, reduction of carboxamide groups to carbinol derivatives, transpeptidation and formation of a hydantoin derivative have been observed in model experiments by using sodium in excess.

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