SYNTHESIS OF (2(R)UNDER-BAR,3(S)UNDER-BAR)[4-H-2(3)]VALINE - APPLICATION TO THE STUDY OF THE RING EXPANSION OF PENICILLIN-N BY DEACETOXYCEPHALOSPORIN-C SYNTHASE FROM STREPTOMYCES-CLAVULIGERUS
Je. Baldwin et al., SYNTHESIS OF (2(R)UNDER-BAR,3(S)UNDER-BAR)[4-H-2(3)]VALINE - APPLICATION TO THE STUDY OF THE RING EXPANSION OF PENICILLIN-N BY DEACETOXYCEPHALOSPORIN-C SYNTHASE FROM STREPTOMYCES-CLAVULIGERUS, Tetrahedron, 51(14), 1995, pp. 4089-4100
A new synthesis of (<2(R)under bar>,<3(S)under bar>)[4-H-2(3)] valine
was developed, and used to synthesise (<2(R)under bar>) [2'-H-2(3)]-pe
nicillin N via a chemico-enzymatic synthesis. This labelled penicillin
was then used to demonstrate the stereospecific ring expansion of pen
icillin N to deacetoxycephalosporin C by deacetoxycephalosporin C synt
hase from Streptomyces clavuligerus.