The invention embraces compounds of formula ##STR1## and salts thereof, wherein: X and Y are independently selected from various optionally substituted alkoxy, alkenyloxy, alkynyoxy and phenoxy groups; W is oxygen or sulfur; R.sub.1 is hydrogen or alkyl; E is CH or N; R.sub.2 and R.sub.3 are independently selected from various halo, alkyl, alkoxy and amino substituents. The compounds of the invention show herbicidal properties particularly for the control of broad leaf plants in grass crops such as wheat. In further embodiments the invention provides processes for the preparation of compounds I, intermediates useful in the preparation of compounds of formula I, compositions containing as active ingredient a compound of formula I and herbicidal and plant growth regulating processes utilizing compounds of formula I.
Synthesis of 7-Arylpurines from Substituted Pyrimidines
作者:Irina Novosjolova、Māris Turks、Armands Sebris
DOI:10.1055/a-1898-9675
日期:2022.12
A simple three-step approach for the synthesis of substituted N7-arylpurines with an overall yield of the whole sequence from 40% to 71% is described. N7-Arylpurines were constructed by de novo synthesisfrom commercially available substituted 4-chloropyrimidine-5-amines. Different substituents at purine C2 and C6 were obtained by changing the corresponding substituents of the starting pyrimidine.