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.
Thiazolidine ring opening in penicillin derivatives. Part 2. Enamine formation
作者:Andrew M. Davis、Nicola J. Layland、Michael I. Page、Frances Martin、Rory More O'Ferrall
DOI:10.1039/p29910001225
日期:——
the thiazolidine ring and reversibly generate an enamine intermediate. Kinetic analysis and hydrolysis in D2O do not indicate a significant build-up of this intermediate during hydrolysis of the methyl ester. However, over the pH range 4–11 the rate of thiazolidine ringopening is competitive with hydrolysis of the ester function. The deuterium solvent kinetic isotope effect on the ring closure reaction