(2R,4S)-2-Aminomethyl-5,5-dimethyl-1,3-thiazolidine-4-carboxylic Acid Dihydrochloride: Synthesis, Epimerization, and Derivatives
作者:Peter Imming
DOI:10.1002/ardp.19953280115
日期:——
The preparation of the title compound 6a from penicillamine 5 or from penicillins 7, the spectroscopic data and stereochemical assignments are given. 6a quickly epimerizes at C‐2 in dilute aqueous solution. Details are given along with the preparation of the new thiazolidines 10–13 from 6.
Synthesis of the First Penicillin Derivatives with Medium-Sized Lactam Ring and of Related Thiazolidines
作者:Peter Imming
DOI:10.1002/ardp.19953280302
日期:——
The novel concept of penicillin derivatives 4 with a medium‐sized instead of a β‐lactamring is presented. Two synthetic paths were invented, resulting in the evaluation of the synthetic potential in the succinic, glutaric, and adipic acid series. A number of novel penicillin‐derived thiazolidines were prepared, notably the derivatives 16 and 22 with anellated 7‐ and 13‐membered lactamring.