Synthesis and SAR study of novel 7-(pyridinium-3-yl)-carbonyl imidazo[5,1-b]thiazol-2-yl carbapenems
摘要:
A new series of 10-methyl carbapenems, possessing a 7-substituted imidazo[5, 1-b]thiazol-2-yl group directly attached to the C-2 position of the carbapenem nucleus, was synthesized and evaluated for antibacterial activity. These compounds showed potent activities against Gram-positive bacteria, in particular methicillin-resistant Staphylococcus aureus (MRSA) and penicillin-resistant Streptococcus pneumoniae (PRSP). They also exhibited potent activity against beta-lactamase-negative ampicillin-resistant Haemophilus influenzae (BLNAR). (c) 2006 Elsevier Ltd. All rights reserved.
An objective of the present invention is to provide carbapenem derivatives which have strong antibiotic activity also against MRSA, PRSP, Influenzavirus, and &bgr;-lactamase producing bacteria and are stable to DHP-1. The carbapenem derivatives according to the present invention are compounds represented by formulae (I) and (II) or pharmaceutically acceptable salts thereof:
1
wherein R
1
represents H or methyl, R
2
and R
3
each independently represent H; halogen; substituted or unsubstituted alkyl; cycloalkyl; substituted or unsubstituted alkylcarbonyl; carbamoyl; substituted or unsubstituted aryl; substituted or unsubstituted alkylthio; morpholinyl; alkylsulfonyl; or formyl, n is 0 (zero) to 4, and Hy represents a substituted or unsubstituted monocyclic or bicyclic heterocyclic group.
An objective of the present invention is to provide carbapenem derivatives which have strong antibiotic activity also against MRSA, PRSP, Influenzavirus, and β-lactamase producing bacteria and are stable to DHP-1. The carbapenem derivatives according to the present invention are compounds represented by formulae (I) and (II) or pharmaceutically acceptable salts thereof:
wherein R
1
represents H or methyl, R
2
and R
3
each independently represent H; halogen; substituted or unsubstituted alkyl; cycloalkyl; substituted or unsubstituted alkylcarbonyl; carbamoyl; substituted or unsubstituted aryl; substituted or unsubstituted alkylthio; morpholinyl; alkylsulfonyl; or formyl, n is 0 (zero) to 4, and Hy represents a substituted or unsubstituted monocyclic or bicyclic heterocyclic group.
A new series of 10-methyl carbapenems, possessing a 7-substituted imidazo[5, 1-b]thiazol-2-yl group directly attached to the C-2 position of the carbapenem nucleus, was synthesized and evaluated for antibacterial activity. These compounds showed potent activities against Gram-positive bacteria, in particular methicillin-resistant Staphylococcus aureus (MRSA) and penicillin-resistant Streptococcus pneumoniae (PRSP). They also exhibited potent activity against beta-lactamase-negative ampicillin-resistant Haemophilus influenzae (BLNAR). (c) 2006 Elsevier Ltd. All rights reserved.