Dehydrooligopeptides. V. Synthesis of N-carboxy .ALPHA.-dehydroamino acid anhydrides and their transformation to .ALPHA.-dehydroamino acid and dehydrooligopeptide derivatives.
The synthesis of N-carboxy α-dehydroamino acid anhydrides (ΔNCA) from benzyloxycarbonyl-α-dehydroamino acids and the subsequent conversion of these products into new α-dehydroamino acid and dehydrooligopeptide derivatives are described. It was found that the new ΔNCA derivatives were very useful synthons for dehydropeptides. The racemization behavior and configurational determination of all the new dehydrooligopeptides thus obtained are discussed.
Photochemistry of dehydrodipeptides related to β-lactam antibiotics
作者:Prabir K. Sen、Christopher J. Veal、Douglas W. Young
DOI:10.1039/p19810003053
日期:——
The photochemistry of a series of β-thioacrylamides has been investigated. The acyclic compounds (9)–(12) undergo cis–trans isomerisation and cyclisation to oxazoles such as (13) and (21). The cyclic β-thioacrylamide (23) undergoes a π2s+π2s cycloaddition reaction to give the interesting tricyclic β-lactam (29).
Synthesis and reactions of α-thioformyl dipeptides, possible biogenetic precursors of penicillin
作者:John Cheney、Clive J. Moores、James A. Raleigh、A. Ian Scott、Douglas W. Young
DOI:10.1039/p19740000986
日期:——
Thioformyl dipeptides (II) have been synthesised by various routes and the existence of these unstable compounds has been verified by trapping experiments. At room temperature the thioaldehydes polymerise readily and at lower temperatures the thioenol forms are stabilised. When thioenolisation is prevented by the presence of an α-methyl substituent as in (XX), polymerisation is the only observable
作者:Prabir K. Sen、Christopher J. Veal、Douglas W. Young
DOI:10.1039/c39770000678
日期:——
The dehydrovaline acrylamide (3) has been photolysed to yield the novel fused β-lactamsystem (4); this finding opens up a possible route to compounds which may be of interest in the light of current views on the mode of action of β-lactam antibiotics.
Cyclisation of a dehydropeptide derivative: a model for cypridina luciferin biosynthesis
作者:Frank McCapra、Martin Roth
DOI:10.1039/c39720000894
日期:——
The structure of Cypridina luciferin suggests a biosynthesis from three amino-acids; cyclisation of a modified tripeptide proceeds in excellent yield, providing a useful route to this interesting class of compound.