BAGGALEY, KEITH H.;ELSON, STEPHEN W.;NICHOLSON, NEVILLE H.;SIME, JOHN T., J. CHEM. SOC. PERKIN TRANS. PT 1,(1990) N, C. 1513-1520
作者:BAGGALEY, KEITH H.、ELSON, STEPHEN W.、NICHOLSON, NEVILLE H.、SIME, JOHN T.
DOI:——
日期:——
Studies on the biosynthesis of clavulanic acid. Part 4. Synthetic routes to the monocyclic β-lactam precursor, proclavaminic acid
作者:Keith H. Baggaley、Stephen W. Elson、Neville H. Nicholson、John T. Sime
DOI:10.1039/p19900001513
日期:——
Aldol condensation of 3-substituted propionaldehydes with the lithium enolate of ethyl or benzyl (2-oxoazetidin-1-yl)acetate yielded derivatives of proclavaminicacid. The proportion of the threo diastereoisomer in the aldol product could be increased by thermodynamically controlled equilibration with 1,5-diazabicyclo[4.3.0]non-5-ene. In the case of benzyl 5-azido-3-hydroxy-2-(2-oxoazetidin-1-yl)valerate