作者:S. D. Sharma、Verinder Kaur、Punita Bhutani、J. P. S. Khurana
DOI:10.1246/bcsj.65.2246
日期:1992.8
Annelation of 2-methylthio-3,4-dihydropyrimidine (3) with two moles of phenoxyacetyl chloride in presence of triethylamine did not yield the expected β-lactam (6) and instead the N-acylated compound 5a was obtained. Various N-acylated pyrimidines 5a–d also failed to yield any β-lactam. However, β-lactam ring has been conveniently grafted on to 2-methylthio-3,6-dihydropyrimidines 9a–d, 12 by annelating them with in situ prepared aryloxyketenes to furnish novel 1-aza analogs of cephem 10a–e and 13.
在三乙胺存在下,2-甲硫基-3,4-二氢嘧啶(3)与两摩尔的苯氧乙酰氯进行环化反应,并未得到预期的β-内酰胺(6),而是生成了N-酰化化合物5a。各种N-酰化的嘧啶5a–d也无法生成任何β-内酰胺。然而,β-内酰胺环已成功地通过现场制备的芳氧基乙烯酮环化接枝到2-甲硫基-3,6-二氢嘧啶9a–d、12上,从而得到了新型头孢烯10a–e和13的1-氮类似物。