Attachment of a styryl group to the 6-position of a protected penicillanic acid via cobaloxime-mediated radical alkyl-alkenyl cross coupling
摘要:
Cobaloxime-catalyzed cross coupling of styrene with 6 alpha-bromopenicillanic acid pivalolyloxymethyl ester (4) introduces a styryl group into the 6 position of the penicillanic acid nucleus. The method should be capable of introducing a variety of aryl-substituted alkenes into the 6 position. Such compounds may be useful as novel beta-lactam antibiotics/beta-lactamase inhibitors. Copyright (C) 1996 Elsevier Science Ltd
6-APA derivatives were considered as selective labels for the construction of bifunctional linkers dedicated to the oriented immobilization of proteins on materials. Sulbactam-like compounds (i.e., 6-β-sulfonamido-penam sulfones) and penicillin G—like compounds (i.e., para-substituted 6-β-phenylacetamido-penams) were prepared and tested as irreversible inhibitors of representative β-lactamases and
]benzoyl}amino derivatives of 6‐apa. Benzyl derivatives were synthesized in several steps, starting with 4‐aminobenzoyl chloride. The treatment of 4‐[3‐benzyl‐4‐oxo‐1,3‐thia(oxa)zolidin‐2‐ylidene]amino}benzoyl chlorides with 6‐apa in ethanolic solution produced the 6‐[bis(4‐[3‐benzyl‐4‐oxo‐1,3‐thiazolidin‐2‐ylidene]amino}benzoyl)amino] derivative of penicillanicacid, while the reaction of the same
Hybrid molecules QA, wherein Q is an aminoquinoline and a is an antibiotic or a resistance enzyme inhibitor, their synthesis and their uses as antibacterial agent
申请人:Sanchez Muriel
公开号:US20060025327A1
公开(公告)日:2006-02-02
Aminoquinoline-antibiotic hybrid compounds in the form of hybrid molecules QA, wherein Q is an aminoquinoline and A is an antibiotic or a resistance enzyme inhibitor, their synthesis and their uses as antibacterial agent. This compound is defined by the general formula (I):
Q-(Y
1
)
p
—(U)
p′
—(Y
2
)
p″
-A (I)
in which
Q represents an aminoquinoline, (Y
1
)
p
—(U)
p′
—(Y
2
)
p″
— is an optional spacer arm and A is an antibiotic, one of its derivatives or precursors, or a resistance enzyme inhibitor. The invention unexpectedly enables the activity of the antibiotic to be improved.
The synthesis of a series of 6,6-disubstitutedpenems starting from penicillanate 5a is described. These penems were isolated and characterized as their pivaloyloxy methyl ester.
6-Perhaloalkylsulfonyloxy-penicillanic acids and derivatives thereof
申请人:Pfizer Inc.
公开号:US04356122A1
公开(公告)日:1982-10-26
6-Alpha and 6-beta-substituted penicillanic acid derivatives of the formula: ##STR1## wherein R is H or a conventional penicillin carboxy protecting group or an ester forming residue readily hydrolyzable in vivo and R.sup.1 is a perhaloalkyl group of from 1 to 4 carbon atoms wherein the halogen atoms are fluoro or chloro, undergo SN.sub.2 nucleophilic displacement with halide or azide ions with inversion of configuration at C-6 to yield the corresponding 6-beta or 6-alpha-halo- or azido-substituted product.