Studies of organophosphorochloridates. Part III. Synthesis of N-substituted pyrophosphoramides
作者:R. J. W. Cremlyn、B. B. Dewhurst、D. H. Wakeford
DOI:10.1039/j39710002028
日期:——
The synthesis of a series of novel N-symmetrical and unsymmetrical pyrophosphoramides is described, and their i.r., n.m.r., and mass spectra are discussed. The hydrolysis of the pyrophosphoramides and their reactions with other nucleophilic reagents have been investigated.
Development of an Isolable Active Ester, Diethyl Thiophosphoryl [(Z)-(2-Aminothiazol-4-yl)-2-(Methoxyimino)acetate (DAMA) for the Synthesis of Cefotaxime
作者:Man-Young Yoon、Hee-Bong Lee、Hyun-Ik Shin
DOI:10.5012/bkcs.2011.32.2.407
日期:2011.2.20
An isolable activated ester, diethyl thiophosphoryl [(Z)-(2-aminothiazol-4-yl)-2-(methoxyimino)acetate (9a, DAMA) was prepared in high purity, which was at least stable for 7 d at $25^\circ}C$ and 6 months at $5^\circ}C$. Its reaction with 7-ACA (4) in the presence of tributylamine in i-PrOH provided cefotaxime (1) of high purity in good yield. Preparation of DAMA and its reaction with 7-ACA (4) to 1 was performed in one-pot manner, respectively with minimal unit operations of stirring and filtration.