β Scribed by Wu Tang; De-Qing Shi
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A series of novel 1,2,4βtriazolo[1,5βa]pyrimidine derivatives containing an Ξ±βamino phosphonate moiety 5 were designed and synthesized by the multiβstep reactions. Their structures were clearly confirmed by spectroscopic data (IR, ^1^H NMR, ^31^P NMR, MS) and elemental analysis, compound 5b was further determined by Xβray diffraction crystallography. The results of preliminary bioassay indicated that some of the title compounds 5 possessed moderate herbicidal activities against dicotyledonous plants (Brassica campestris L) at the concentration of 100 mg/L. For example, compound 5i possessed 92.0% inhibitory activity against B. campestris L and showed better activity than that of the commercialized herbicide Bispyribacβsodium; however, compounds 5 displayed weak herbicidal activity at the concentration of 10 mg/L. J. Heterocyclic Chem., (2010).
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