The Synthesis of Substituted Penicillins and Simpler Structural Analogs. V. The Application of 5-Phenyloxazolidine-2,4-diones to the Synthesis of Phenylacetylamino-β-lactams
A new method for preparing D-penicillamine. Reaction of benzylpenicilloic acid .ALPHA.-amides with arylamines.
作者:TOSHIHISA OGAWA、KAZUYUKI TOMISAWA、KAORU SOTA
DOI:10.1248/cpb.36.1957
日期:——
Benzylpenicilloic acid α-amides (1a-d) prepared by aminolysis of benzylpenicillin were treated with arylamines (2, 7, 9 and 13a-f) in the presence of acetic acid to give D-penicillamine (3) in good yield and high purity. The structures pf the by-products formed in these reactions were also determined.
A study of fragmentation of protonated amides of some acylated amino acids by tandem mass spectrometry: observation of an unusual nitrilium ion
作者:Erach R. Talaty、Sarah M. Young、Ryan P. Dain、Michael J. Van Stipdonk
DOI:10.1002/rcm.4965
日期:2011.5.15
ionization (ESI) was conducted. Among the fragment ions observed was an unusual one, which we have determined to be a nitrilium ion having the structure or by loss of the full mass of glycine as a neutral fragment. A mechanism that we propose involves an initial protonation of the oxygen atom at the N‐terminus, followed by cyclization to a five‐membered imidazolium ring, and its subsequent collapse to