4,5,6H-oxazine-1,2 N-oxides in the 1,3-cycloaddition reaction
作者:I. E. Chlenov、V. I. Khudak、L. N. Kolymagina、N. S. Morozova、V. A. Tartakovskii
DOI:10.1007/bf00996519
日期:1970.8
Amino acids Communication 2. Synthesis of DL-proline from nitroacetic ester derivatives
作者:K. K. Babievskii、V. M. Belikov、Yu. N. Belokon'
DOI:10.1007/bf00847892
日期:1965.7
γ-Lactam analogues of penicillanic and carbapenicillanic acids
作者:Jack E. Baldwin、Ming Fai Chan、Gerard Gallacher、Masami Otsuka、Peter Monk、Keith Prout
DOI:10.1016/s0040-4020(01)98828-3
日期:——
(12a) and (12b) in a ratio of 85 : 15. They are transformed to the carbapenam analogues (1)-(4). Their stereochemistry was assigned according to the X-ray structure of the γ-lactam (12b). Benzyl 6-oxopenicillanate (20) was directly transformed to the γ-lactamanalogue (5) a novel ring expansion. These synthetic analogues did not show antibiotic activity or β-lactamase inhibition. Treatment of pyrro1idine-2