Pyrimidine derivatives, herbicides and plant growth regulators

Details Pyrimidine derivatives, herbicides and plant growth regulators Pyrimidine derivatives, herbicides and plant growth regulators

1996-02-09

1998-06-30

Ford, John M.

Plant protecting and regulating compositions

Plant growth regulating compositions

Organic active compound containing

504168, 504177, 504178, 544242, 544335, C07D23926, A01N 4354

Patent

active

057733880

DESCRIPTION:

BRIEF SUMMARY
This is a 371 of PCT/JP94/01311 filed Aug. 9, 1994.


TECHNICAL FIELD

The present invention relates to novel pyrimidine derivatives, and herbicides and plant growth regulators containing such derivatives as active ingredients. The derivatives are also useful as intermediates for medicines and agricultural chemicals.


BACKGROUND TECHNIQUE

It has not been known at all that the group of compounds of the present invention which contain a pyrimidine ring having hydrogen atoms at the 2- and 6-positions and having specific substituents introduced at the 4- and 6-positions exhibit a herbicidal activity and a plant growth regulating activity. Further, none of their chemical structures have not been known except that those of three compounds, 4-methyl-5-acetylpyrimidine, 4-tert-butyl-5-tert-butylcarbonylpyrimidine and 4-phenyl-5-benzoylpyrimidine, are disclosed in Journal of Heterocyclic Chemistry, Vol. 20, 1983, p. 649.
In order to protect important crop plants such as rice, soybean, wheat, corn, cotton and sugar beet and increase their productivities, many herbicides have been put in practical use so far. These herbicides are roughly classified into three categories, those for upland fields, for paddy fields, and for non-agricultural fields, according to the application site. Further, each category can be classified as a soil incorporation type, a pre-emergence soil treatment type and a post-emergence treatment (foliage treatment) type, according to the manner of application.
With the recent global population explosion, the productivities of important crop plants will undoubtedly affect the food economy of each country. These changes will be inevitably accompanied by changes of the conventional mode of agriculture toward the 21st century. Actually, development of herbicides which can economically and effectively kill or control weeds detrimental to the growth of crop plants, is becoming more and more important to farmers than ever.
As such herbicides, chemicals which meet the following requirements are desired to be developed.
Those having high herbicidal effects at low doses (it is necessary to kill weeds at as low doses as possible from the viewpoint of environmental protection), those having adequate residual activities (since a problem that soil-persistent chemicals damage next crops has arisen recently, it is important to show an adequate residual activity after application), those which promptly kill weeds upon application (it is possible to sow or transplant next crops soon after chemical treatment), those which do not require frequent treatment (it is important for farmers to minimize the frequency of cumbersome weed control operations), those intended to control a wide range of weeds (chemicals capable of controlling a variety of weeds having different properties such as broad-leaves weeds, graminaceous weeds and perennial weeds independently, are desirable), those which can be applied by various methods (a stronger herbicidal effect can be obtained by combining an effect of soil treatment, an effect of foliage treatment and so on), and those which do not show any problematic phytotoxicity against crop plants (in a field where a crop plant coexists with weeds, those capable of selectively killing weeds are desired), are preferred. However, no existing herbicides satisfy all of these requirements.
On the other hand, diseases and insect pests, which are a hindrance to farmers in crop cultivation, are effectively controlled by excellent fungicides and insecticides. However, in addition to these harmful organisms, there are other factors which lower the yield and the qualities. For example, wind or rain lodges barley, rye, wheat, rice, corn, soybean or cotton at time of harvesting. One of the easiest and most effective preventive measures is to suppress internode elongation for the purpose of preventing lodging of these crop plants, and therefore development of growth retardants which have no influence on yield is becoming more and more necessary than ever. As such growth retardants, chemicals which meet t

REFERENCES:
Mosti et al, J. Het. Chem, vol. 20, pp. 649-654 (1983).
Gromov et al, Chemical Abstracts, vol. 119 entry 180724 (1993).
Mosti et al. Chemical Abstracts vol. 99, entry 194910 (1983).

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