USH1829H

USH1829H - Fungicidal fused bicyclic pyrimidinones

Info

Publication number: USH1829H
Application number: US08/333,179
Authority: US
Inventors: James Francis Bereznak
Original assignee: EI Du Pont de Nemours and Co
Current assignee: EIDP Inc
Priority date: 1994-11-02
Filing date: 1994-11-02
Publication date: 2000-01-04

Abstract

This invention pertains to compounds of Formula I including all geometric and stereoisomers, N-oxides, agriculturally-suitable salts thereof, agricultural compositions containing them and their use as fungicides: ##STR1## wherein: Q is O or S; and n, R¹, R², X, and Y are described in the text.

Description

This invention relates to certain 4(3H)-quinazolinones, their agriculturally suitable salts and compositions, and methods of their use as general or selective fungicides, in particular for the control of cereal powdery mildew both preventive and curative.

U.S. Pat. Nos. 3,755,582 and 3,867,384 disclose certain 4(3H)-quinazolinone fungicides. These patents, however, do not specifically disclose the compounds of the present invention.

SUMMARY OF THE INVENTION

This invention comprises compounds of Formula I including all geometric and stereoisomers, N-oxides, agriculturally-suitable salts thereof, agricultural compositions containing them and their use as fungicides: ##STR2## wherein: n is 0-4;

Q is O or S;

each R¹ is independently selected from the group C₁ -C₄ alkyl, C₁ -C₂ haloalkyl and halogen;

R² is selected from the group C₃ -C₁₀ alkyl, C₅ -C₇ cycloalkyl, C₃ -C₁₀ alkenyl, C₃ -C₁₀ alkynyl, C₄ -C₁₀ cycloalkylalkyl and C₂ -C₁₀ alkoxyalkyl;

X is halogen;

Y is hydrogen or halogen;

provided that

(i) when n is 1 and R¹ is C₁ -C₄ alkyl or n is 2 and both R¹ are C₁ -C₄ alkyl, then at least one R¹ is attached to the cyclopropyl ring; and

(ii) when n is 0, Q is O, R² is n-propyl, and Y is H, then X is F, Cl or I.

DETAILED DESCRIPTION OF THE INVENTION

Terms are used in the above recitations in accordance with the following denotations.

"Alkyl", used either alone or in compound words such as "haloalkyl" denotes straight-chain or branched alkyl; e.g., methyl, ethyl, n-propyl, i-propyl, or the different butyl, pentyl, hexyl, etc. isomers.

"Cycloalkyl" denotes cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and cycloheptyl.

"Cycloalkylalkyl" denotes a cycloalkyl ring attached to a branched or straight-chain alkyl; e.g., cyclopropylmethyl and cyclohexylbutyl.

"Alkenyl" denotes straight chain or branched alkenes; e.g., 1-propenyl, 2-propenyl, 3-propenyl and the different butenyl , pentenyl, hexenyl, etc. isomers. "Alkenyl" also denotes polyenes such as 1,3-hexadiene and 2,4,6-heptatriene.

"Alkynyl" denotes straight chain or branched alkynes; e.g., ethynyl, 1-propynyl, 3-propynyl and the different butynyl, pentynyl, hexynyl, etc. isomers. "Alkynyl" can also denote moieties comprised of multiple triple bonds; e.g., 2,7-octadiyne and 2,5,8-decatriyne.

"Alkoxy" denotes methoxy, ethoxy, n-propyloxy, isopropyloxy and the different butoxy, pentoxy, hexyloxy, etc. isomers.

The term "halogen", either alone or in compound words such as "haloalkyl", denotes fluorine, chlorine, bromine or iodine. Further, when used in compound words such as "haloalkyl", said alkyl may be partially or fully substituted with halogen atoms which may be the same or different. Examples of "haloalkyl" include F₃ C, ClCH₂, CF₃ CH₂ and CF₃ CF₂.

The total number of carbon atoms in a substituent group is indicated by the "C_i -C_j " prefix where i and j are numbers from 1 to 10. For example, C₁ -C₃ alkoxyl designates methoxy through propyloxy; C₂ alkoxyalkyl designates CH₃ OCH₂ ; C₃ alkoxyalkyl designates, for example, CH₃ OCH₂ CH₂ or CH₃ CH₂ OCH₂ ; and C₄ alkoxyalkyl designates the various isomers of an alkoxy group substituted with a second alkyl group containing a total of 4 carbon atoms, examples including CH₃ CH₂ CH₂ OCH₂ and CH₃ CH₂ OCH₂ CH₂.

Preferred for reasons of ease of synthesis or greater fungicidal activity are:

Preferred 1. The compounds of Formula I as defined above, or agriculturally-suitable salts thereof, wherein:

Q is O;

R¹ is selected from the group C₁ -C₂ alkyl, C₁ -C₂ haloalkyl and halogen; and

R² is selected from the group C₃ -C₅ alkyl, C₅ cycloalkyl, C₃ -C₅ alkenyl, C₃ -C₅ alkynyl, C₄ -C₆ cycloalkylalkyl and C₂ -C₅ alkoxyalkyl.

Preferred 2. The compounds of Preferred 1 wherein:

R¹ is selected from the group CH₃, CF₃ and halogen; and

R² is selected from the group C₃ -C₅ alkyl, C₃ -C₅ alkenyl, C₃ -C₅ alkynyl and C₂ -C₅ alkoxyalkyl.

Preferred 3. The compounds of Preferred 2 wherein:

X is Cl, Br, or I.

Preferred 4. The compounds of Preferred 3 wherein:

R² is selected from the group C₃ -C₅ alkyl, C₃ -C₅ alkenyl and C₃ -C₅ alkynyl.

Preferred 5. The compounds of Preferred 4 wherein said compounds are selected from the group:

3-(cyclopropylmethyl)-6-iodo-2-propyloxy-4(3H)-quinazolinone,

3-(cyclopropylmethyl)-6,8-diiodo-2-propyloxy-4(3H)-quinazolinone,

3-(cyclopropylmethyl)-6,8-dibromo-2-propyloxy-4(3H)-quinazolinone and

6-chloro-3-(cyclopropylmethyl)-2-propyloxy-4(3H)-quinazolinone.

It is recognized that some reagents and reaction conditions described below for preparing compounds of Formula I may not be compatible with some functionalities claimed for R¹, R², n, Q, X, and Y. In these cases, the incorporation of protection/deprotection sequences into the synthesis may be necessary in order to obtain the desired products. The cases in which protecting groups are necessary, and which protecting group to use, will be apparent to one skilled in chemical synthesis. See Greene, T. W. and Wuts, P. G. M.; Protective Groups in Organic Synthesis, 2nd Ed.; John Wiley & Sons, Inc.; New York, (1980) for suitable protecting groups.

In the following description of the preparation of compounds of Formula I, compounds of Formulae Ia (Formula I where Q is 0) and lb (Formula I where Q is S) are various subsets of the compounds of Formula I. All substituents in compounds of Formulae Ia and Ib and 2-5 are as defined above for Formula I.

Compounds of this invention can exist as one or more stereoisomers. The various stereoisomers include enantiomers, diastereomers and geometric isomers. One skilled in the art will appreciate that one stereoisomer may be more active than the others and how to separate said stereoisomers. Accordingly, the present invention comprises mixtures, individual stereoisomers, and optically active mixtures of compounds of Formula I, as well as agriculturally suitable salts thereof.

The compounds of Formula I can be prepared as described below in Schemes 1-3 and in the Example.

Synthesis of Compounds of Formula I

Compounds of Formula Ia, compounds of Formula I wherein Q is O, can be made by the method illustrated in Scheme 1.

An anthranilic acid (2-aminobenzoic acid) of Formula 2 is condensed with an isothiocyanate of Formula 1 to form the 2-thioquinazolinedione of Formula 3. This condensation is preferably performed in the presence of a base such as triethylamine. S-Methylation of this compound affords the 2-methylthio-4(3H)-quinazolinone of Formula 4.

For the introduction of the R² O group, the 2-methylthio-4(3H)-quinazolinone of Formula 4 is treated with a mixture of a base, for example sodium hydride, in R² OH solvent. The reaction mixture is stirred at a temperature from about 0° C. to 120° C. for 1-120 hours. The desired 2-R² O-4(3H)-quinazolinone can be isolated from the reaction mixture by extraction into a water-immiscible solvent, and purified by chromatography or recrystallization. Similar synthetic procedures are described in U.S. Pat. No. 3,755,582, incorporated herein by reference. ##STR3##

Anthranilic acids of Formula 2 are known or can be prepared by known methods. For example see, March, J. Advanced Organic Chemistry; 3rd ed., John Wiley: New York, (1985), p 983. The isothiocyanates of Formula 1 can be prepared from the corresponding amine by treatment with thiophosgene as known in the art. For example, see J. Heterocycl. Chem., (1990), 27, 407.

Alternatively, 2-thioquinazolinediones of Formula 3 can be prepared by treatment of the (C₁ -C₄ alkyl) anthranilic acid ester of Formula 5 with thiophosgene to form the isothiocyanate ester, followed by treatment with an amine of Formula 6 (Scheme 2). ##STR4##

The anthranilic acid ester of Formula 5 is treated with thiophosgene at a temperature from about -20° C. to 100° C. for 1 to 48 hours optionally in an inert solvent. Often this reaction is performed in a biphasic mixture in the presence of a base, such as calcium carbonate, and an acid, such as aqueous hydrochloric acid. The resulting isothiocyanate may be isolated by extraction into a water-immiscible solvent, such as methylene chloride, followed by drying of the organic extracts and evaporation under reduced pressure. Alternatively, the isothiocyanate can be combined in situ with the amine of Formula 6 and stirred at about -20° C. to 50° C. for 0.1 to 24 hours. The desired 2-thioquinazolinediones of Formula 3 can be isolated from the reaction mixture by aqueous extraction, and purified by chromatography or recrystallization. Similar synthetic procedures are described in J. Heterocycl. Chem., (1990), 27, 407.

Compounds of Formula Ib, compounds of Formula I wherein Q is S, can be prepared as illustrated in Scheme 3. ##STR5##

Treatment of the quinazolinone of Formula Ia with phosphorous pentasulfide or Lawesson's reagent [2,4-bis(4-methoxyphenyl)-1,3-dithia-2,4-diphosphetane-2,4-disulfide] in an inert solvent such as dioxane at a temperature from 0° C. to the reflux temperature of the solvent for 0.1 to 72 hours affords the quinazolinethione of Formula lb. This procedure is described in the literature, for example see U.S. Pat. No. 3,755,582.

In addition to the methods described above, compounds of Formula Ia can be prepared by displacement of the 2-chlorine in the appropriate 4(3H)-quinazolinone, rather than by displacement of the 2-SCH₃ group (Scheme 1). The appropriate 2-chlorine compounds for this method can be prepared as described in U.S. Pat. No. 3,867,384.

Salts of compounds of Formula I can be formed by treating the free base of the corresponding compound with strong acids such as hydrochloric or sulfuric acid. N-Oxides of compounds of Formula I can be made by oxidizing the corresponding reduced nitrogen compound with a strong oxidizing agent such as meta-chloroperoxybenzoic acid.

EXAMPLE Synthesis of 3-(Cyclopropylmethyl)-6-iodo-2-propyloxy-4(3H)-quinazolinone

Step A:

A mixture of 2-amino-5-iodo-benzoic acid (6.2 g), triethylamine (2.4 g) and cyclopropylmethyl isothiocyanate (2.5 g) in ethanol (35 mL) is heated under reflux for 18 h. After cooling to 0° C., the reaction mixture is filtered and the filter cake is washed with ethanol and hexanes to deliver 6.3 g of intermediate A.

Step B:

lodomethane (5.0 mL) is added to the product of Step A (5.7 g) and potassium carbonate (22.17 g) in dimethylformamide (160 mL) at room temperature. After stirring at room temperature for 3 h, the reaction mixture is concentrated to dryness in vacuo and the resulting residue is partitioned between 450 mL each of ethyl acetate and water. Following separation of the organic layer and additional washings with water and brine (250 mL each), the organic layer is dried (Na₂ SO₄ anhydrous), and concentrated in vacuo. The resulting residue is treated with cold hexanes and filtered to provide Intermediate B.

Step C:

A solution of sodium propoxide in DMF (prepared by adding 0.50 g of 60% NaH/mineral oil to a solution of 0.73 g n-propanol in 15 mL DMF) is treated with the product of Step B (1.2 g) and stirred at room temperature for 1 h. The reaction is then quenched with 1 mL aqueous NaHCO₃ and concentrated to dryness in vacuo. The residue so obtained is partitioned between CH₂ CI₂ and water (200 rnL each) and the organic phase is separated. After washing with more water and brine, the CH₂ Cl₂ phase is dried (Na₂ SO₄ anhydrous), concentrated, and purified by column chromatography to afford the title compound.

Using the procedures outlined in Schemes 1-3 and the above Example, the compounds of Tables 1-9 hereinafter can be prepared. The formula referred to in the Tables which follow is illustrated below: ##STR6##

The following abbreviations are used in the Tables which follow. All alkyl groups are the nornal isomers unless indicated otherwise.

______________________________________                                    
       t = tertiary Et = ethyl                                            
       n = normal   Pr = propyl                                           
       i = iso      c = cyclo                                             
       Me = methyl  Bu = butyl                                            
______________________________________

              TABLE 1                                                     
______________________________________                                    
Compounds of Formula I wherein Q = O, X = I, Y = H,                       
R.sup.2 = n-propyl and                                                    
(R.sup.1).sub.n                                                           
       (R.sup.1).sub.n                                                    
                 (R.sup.1).sub.n                                          
                            (R.sup.1).sub.n                               
                                    (R.sup.1).sub.n                       
______________________________________                                    
H      3-CF.sub.3                                                         
                 3,3,4,4-tetra-F                                          
                            3-Me    3,3-di-CF.sub.2 CF.sub.3              
2-Et   1-Me, 3-CF.sub.3                                                   
                 1-Et, 3-i-Pr,                                            
                            3-n-Bu  3-CCl.sub.2 CF.sub.3                  
                  4,4-di-F                                                
3,3-di-F                                                                  
       3,3-di-Me 3,3-di-Cl  3,4-di-Et                                     
                                    3,3-di-Br                             
3,4-di-Cl                                                                 
       3-t-Bu    3,3-di-Et, 1-Me, 3-Pr                                    
                                    2-Me, 3-i-Bu                          
                 4,4-di-Cl                                                
______________________________________

              TABLE 2                                                     
______________________________________                                    
Compounds of Formula I wherein Q = O, X = I, Y = H, (R.sup.1).sub.n = H   
and                                                                       
R.sup.2   R.sup.2          R.sup.2                                        
______________________________________                                    
n-Bu      c-pentyl         --(CH.sub.2).sub.4 -c-hexyl                    
n-decyl   --CH.sub.2 C.tbd.CH                                             
                           --CH.sub.2 OCH.sub.3                           
--CH.sub.2 CH═CH.sub.2                                                
          --(CH.sub.2).sub.3 C.tbd.CH                                     
                           --(CH.sub.2).sub.5 O(CH.sub.2).sub.4 CH.sub.3  
--CH.sub.2 -(c-propyl)                                                    
          --CH.sub.2 CH(CH.sub.3)CH═CH.sub.2                          
                           --(CH.sub.2).sub.7 -(c-propyl)                 
c-heptyl  --(CH.sub.2).sub.5 C.tbd.C(CH.sub.2).sub.2 CH.sub.3             
                           --CH(Et)C.tbd.C--Et                            
n-hexyl   --CH.sub.2 CH.sub.2 CH(CH.sub.3).sub.2                          
                           --(CH.sub.2).sub.2 CH═CHCH.sub.3           
--CH.sub.2 -(c-pentyl)                                                    
          --(CH.sub.2).sub.2 OCH.sub.2 CH.sub.3                           
                           --(CH.sub.2).sub.8 CH═CH.sub.2             
______________________________________

              TABLE 3                                                     
______________________________________                                    
Compounds of Formula I wherein (R.sup.1).sub.n = H, R.sup.2 = n-propyl    
and                                                                       
Q      X          Y     Q        X   Y                                    
______________________________________                                    
O      Cl         H     S        Cl  H                                    
O      F          H     S        Br  H                                    
O      Cl         Cl    S        Cl  Cl                                   
O      F          F     S        F   F                                    
O      I          Cl    S        I   H                                    
O      Br         Br    S        I   I                                    
O      I          Br    S        Br  Br                                   
O      Br         I     S        I   Br                                   
______________________________________

              TABLE 4                                                     
______________________________________                                    
Compounds of Formula I wherein W = O, X = I, Y = I, (R.sup.1).sub.n = H   
and                                                                       
R.sup.2   R.sup.2         R.sup.2                                         
______________________________________                                    
n-Bu      c-pentyl        --(CH.sub.2).sub.4 -c-hexyl                     
n-decyl   --CH.sub.2 C.tbd.CH                                             
                          --CH.sub.2 OCH.sub.3                            
--CH.sub.2 CH.tbd.CH.sub.2                                                
          --(CH.sub.2).sub.3 C.tbd.CH                                     
                          --(CH.sub.2).sub.5 O(CH.sub.2).sub.4 CH.sub.3   
--CH.sub.2 -(c-propyl)                                                    
          --CH.sub.2 CH(CH.sub.3)CH═CH.sub.2                          
                          --(CH.sub.2).sub.7 -(c-propyl)                  
c-heptyl  --(CH.sub.2).sub.5 C.tbd.(CH.sub.2).sub.2 CH.sub.3              
                          --CH(Et)C.tbd.C--Et                             
n-hexyl   --CH.sub.2 CH.sub.2 CH(CH.sub.3).sub.2                          
                          --(CH.sub.2).sub.2 CH═CHCH.sub.3            
--CH.sub.2 -(c-pentyl)                                                    
          --(CH.sub.2).sub.2 OCH.sub.2 CH.sub.3                           
                          --(CH.sub.2).sub.8 CH═CH.sub.2              
______________________________________

              TABLE 5                                                     
______________________________________                                    
Compounds of Formula I wherein Q = O, X = I, Y = I,                       
R.sup.2 = n-propyl and                                                    
(R.sup.1).sub.n                                                           
       (R.sup.1).sub.n                                                    
                 (R.sup.1).sub.n                                          
                            (R.sup.1).sub.n                               
                                    (R.sup.1).sub.n                       
______________________________________                                    
H      3-CF.sub.3                                                         
                 3,3,4,4-tetra-F                                          
                            3-Me    3,3-di-CF.sub.2 CF.sub.3              
2-Et   1-Me, 3-CF.sub.3                                                   
                 1-Et, 3-i-Pr,                                            
                            3-n-Bu  3-CCl.sub.2 CF.sub.3                  
                  4,4-di-F                                                
3,3-di-F                                                                  
       3,3-di-Me 3,3-di-Cl  3,4-di-Et                                     
                                    3,3-di-Br                             
3,4-di-Cl                                                                 
       3-t-Bu    3,3-di-Et, 1-Me, 3-Pr                                    
                                    2-Me, 3-i-Bu                          
                 4,4-di-Cl                                                
______________________________________

              TABLE 6                                                     
______________________________________                                    
Compounds of Formula I wherein Q = O, X = Br, Y = H,                      
R.sup.2 n-propyl and                                                      
(R.sup.1).sub.n                                                           
       (R.sup.1).sub.n                                                    
                 (R.sup.1).sub.n                                          
                            (R.sup.1).sub.n                               
                                    (R.sup.1).sub.n                       
______________________________________                                    
1,1-di-F                                                                  
       3-CF.sub.3                                                         
                 3,3,4,4-tetra-F                                          
                            3-Me    3,3-di-CF.sub.2 CF.sub.3              
2-Et   1-Me, 3-CF.sub.3                                                   
                 1-Et, 3-i-Pr,                                            
                            3-n-Bu  3-CCl.sub.2 CF.sub.3                  
                  4,4-di-F                                                
3,3-di-F                                                                  
       3,3-di-Me 3,3-di-Cl  3,4-di-Et                                     
                                    3,3-di-Br                             
3,4-di-Cl                                                                 
       3-t-Bu    3,3-di-Et, 1-Me, 3-Pr                                    
                                    2-Me, 3-i-Bu                          
                 4,4-di-Cl                                                
______________________________________

              TABLE 7                                                     
______________________________________                                    
Compounds of Formula I wherein Q = O, X = Br, Y = H, (R.sup.1).sub.n = H  
and                                                                       
R.sup.2   R.sup.2          R.sup.2                                        
______________________________________                                    
n-Bu      c-pentyl         --(CH.sub.2).sub.4 -c-hexyl                    
n-decyl   --CH.sub.2 C.tbd.CH                                             
                           --CH.sub.2 OCH.sub.3                           
--CH.sub.2 CH═CH.sub.2                                                
          --(CH.sub.2).sub.3 C.tbd.CH                                     
                           --(CH.sub.2).sub.5 O(CH.sub.2).sub.4 CH.sub.3  
--CH.sub.2 -(c-propyl)                                                    
          --CH.sub.2 CH(CH.sub.3)CH═CH.sub.2                          
                           --(CH.sub.2).sub.7 -(c-propyl)                 
c-heptyl  --(CH.sub.2).sub.5 C.tbd.C(CH.sub.2).sub.2 CH.sub.3             
                           --CH(Et)C.tbd.C--Et                            
n-hexyl   --CH.sub.2 CH.sub.2 CH(CH.sub.3).sub.2                          
                           --(CH.sub.2).sub.2 CH═CHCH.sub.3           
--CH.sub.2 -(c-pentyl)                                                    
          --(CH.sub.2).sub.2 OCH.sub.2 CH.sub.3                           
                           --(CH.sub.2).sub.8 CH═CH.sub.2             
______________________________________

              TABLE 8                                                     
______________________________________                                    
Compounds of Formula I wherein Q = O, X = Br, Y = Br, (R.sup.1).sub.n = H 
and                                                                       
R.sup.2   R.sup.2          R.sup.2                                        
______________________________________                                    
n-Bu      c-pentyl         --(CH.sub.2).sub.4 -c-hexyl                    
n-decyl   --CH.sub.2 C.tbd.CH                                             
                           --CH.sub.2 OCH.sub.3                           
--CH.sub.2 CH═CH.sub.2                                                
          --(CH.sub.2).sub.3 C.tbd.CH                                     
                           --(CH.sub.2).sub.5 O(CH.sub.2).sub.4 CH.sub.3  
--CH.sub.2 -(c-propyl)                                                    
          --CH.sub.2 CH(CH.sub.3)CH═CH.sub.2                          
                           --(CH.sub.2).sub.7 -(c-propyl)                 
c-heptyl  --(CH.sub.2).sub.5 C.tbd.C(CH.sub.2).sub.2 CH.sub.3             
                           --CH(Et)C.tbd.C--Et                            
n-hexyl   --CH.sub.2 CH.sub.2 CH(CH.sub.3).sub.2                          
                           --(CH.sub.2).sub.2 CH═CHCH.sub.3           
--CH.sub.2 -(c-pentyl)                                                    
          --(CH.sub.2).sub.2 OCH.sub.2 CH.sub.3                           
                           --(CH.sub.2).sub.8 CH═CH.sub.2             
______________________________________

              TABLE 9                                                     
______________________________________                                    
Compounds of Formula I wherein Q = O, X = Br, Y = Br,                     
R.sup.2 n-propyl and                                                      
(R.sup.1).sub.n                                                           
       (R.sup.1).sub.n                                                    
                 (R.sup.1).sub.n                                          
                            (R.sup.1).sub.n                               
                                    (R.sup.1).sub.n                       
______________________________________                                    
1,1-di-F                                                                  
       3-CF.sub.3                                                         
                 3,3,4,4-tetra-F                                          
                            3-Me    3,3-di-CF.sub.2 CF.sub.3              
2-Et   1-Me, 3-CF.sub.3                                                   
                 1-Et, 3-i-Pr,                                            
                            3-n-Bu  3-CCl.sub.2 CF.sub.3                  
                  4,4-di-F                                                
3,3-di-F                                                                  
       3,3-di-Me 3,3-di-Cl  3,4-di-Et                                     
                                    3,3-di-Br                             
3,4-di-Cl                                                                 
       3-t-Bu    3,3-di-Et, 1-Me, 3-Pr                                    
                                    2-Me, 3-i-Bu                          
                 4,4-di-Cl                                                
______________________________________

Formulation/Utility

Compounds of this invention will generally be used in formulation with an agriculturally suitable composition. The fungicidal compositions of the present invention 10 comprise an effective amount of at least one compound of Formula I as defined above and at least one of (a) a surfactant, (b) an organic solvent, and (c) at least one solid or liquid diluent. Useful formulations can be prepared in conventional ways. They include dusts, granules, pellets, solutions, suspensions, emulsions, wettable powders, emulsifiable concentrates, dry flowables and the like. Sprayable formulations can be extended in suitable media and used at spray volumes from about one to several hundred liters per hectare. High strength compositions are primarily used as intermediates for further formulation. The formulations will typically contain effective amounts of active ingredient, diluent and surfactant within the following approximate ranges which add up 100 weight percent.

______________________________________                                    
               Weight Percent                                             
               Active                                                     
______________________________________                                    
               Ingredient                                                 
                       Diluent  Surfactant                                
______________________________________                                    
Wettable Powders 5-90      0-74     1-10                                  
Oil Suspensions, Emulsions,                                               
                 5-50       40-95   0-15                                  
Solutions, (including Emulsifiable                                        
Concentrates)                                                             
Dusts            1-25       70-99   0-5                                   
Granules, Baits and Pellets                                               
                 0.01-99   5-99.99  0-15                                  
High Strength Compositions                                                
                 90-99     0-10     0-2                                   
______________________________________

Typical solid diluents are described in Watkins, et al., Handbook of Insecticide Dust Diluents and Carriers, 2nd Ed., Dorland Books, Caldwell, N.J. Typical liquid diluents and solvents are described in Marsden, Solvents Guide, 2nd Ed., Interscience, New York, (1950). McCutcheon's Detergents and Emulsifiers Annual, Allured Publ. Corp., Ridgewood, N.J., as well as Sisely and Wood, Encyclopedia of Surface Active Agents, Chemical Publ. Co., Inc., New York, (1964), list surfactants and recommended uses. All formulations can contain minor amounts of additives to reduce foam, caking, corrosion, microbiological growth, and the like.

Methods for formulating such compositions are well known. Solutions are prepared by simply mixing the ingredients. Fine solid compositions are made by blending and, usually, grinding as in a hammer mill or fluid energy mill. Water-dispersible granules can be produced by agglomerating a fine powder composition; see for example, Cross et al., Pesticide Formulations, Washington, D.C., (1988), pp 251.259. Suspensions are prepared by wet-milling; see, for example, U.S. Pat. No.3,060,084. Granules and pellets can be made by spraying the active material upon preformed granular carriers or by agglomeration techniques. See Browning, "Agglomeration", Chemical Engineering, Dec. 4, 1967, pp 147-148, Perry's Chemical Engineer's Handbook, 4th Ed., McGraw-Hill, New York, (1963), pp 8-57 and following, and WO 91/13546. Pellets can be prepared as described in U.S. Pat. No. 4,172,714. Water-dispersible and water-soluble granules can be prepared as taught in DE 3,246,493.

For further information regarding the art of formulation, see U.S. Pat. No. 3,235,361, Col. 6, line 16 through Col. 7, line 19 and Examples 10 through 41; U.S. Pat. No. 3,309,192, Col. 5, line 43 through Col. 7, line 62 and Examples 8, 12, 15, 39, 41, 52, 53, 58, 132, 138-140, 162-164, 166, 167 and 169-182; U.S. Pat. No. 2,891,855, Col. 3, line 66 through Col. 5, line 17 and Examples 1-4; Klingman, Weed Control as a Science, John Wiley and Sons, Inc., New York, (1961), pp 81-96; and Hance et al., Weed Control Handbook, 8th Ed., Blackwell Scientific Publications, Oxford, (1989).

In the following Examples, all percentages are by weight and all formulations are prepared in conventional ways.

EXAMPLE A

______________________________________                                    
Wettable Powder                                                           
3-(Cyclopropylmethyl)-6-iodo-2-propyloxy-4(3H)-quinazolinone              
                             65.0%                                        
dodecylphenol polyethylene glycol ether                                   
                             2.0%                                         
sodium ligninsulfonate       4.0%                                         
sodium silicoaluminate       6.0%                                         
montmorillonite (calcined)   23.0%                                        
______________________________________

EXAMPLE B

______________________________________                                    
Granule                                                                   
3-(Cyclopropylmethyl)-6-iodo-2-propyloxy-4(3H)-quinazolinone              
                             10.0%                                        
attapulgite granules (low volative                                        
                             90.0%                                        
matter, 0.71/0.30 mm; U.S.S. No.                                          
25-50 sieves)                                                             
______________________________________

EXAMPLE C

______________________________________                                    
Extruded Pellet                                                           
3-(Cyclopropylmethyl)-6-iodo-2-propyloxy-4(3H)-quinazolinone              
                             25.0%                                        
anhydrous sodium sulfate     10.0%                                        
crude calcium ligninsulfonate                                             
                             5.0%                                         
sodium alkylnaphthalenesulfonate                                          
                             1.0%                                         
calcium/magnesium bentonite  59.0%                                        
______________________________________

EXAMPLE D

______________________________________                                    
Emulsifiable Concentrate                                                  
3-(Cyclopropylmethyl)-6-iodo-2-propyloxy-4(3H)-quinazolinone              
                             20.0%                                        
blend of oil soluble sulfonates                                           
                             10.0%                                        
and polyoxyethylene ethers                                                
isophorone                   70.0%                                        
______________________________________

The compounds of this invention are useful as plant disease control agents, especially for the control of cereal powdery mildews (e.g., Erysiphe graminis f sp. tritici, the causal agent of wheat powdery mildew). The present invention therefore further comprises a method for controlling plant diseases caused by fungal plant pathogens comprising applying to the plant or portion thereof to be protected, or to the plant seed or seedling to be protected, an effective amount of a compound of Formula I (or an N-oxide or agriculturally-suitable salt thereof) or a fungicidal composition containing said compound. The compounds and compositions of this invention provide control of diseases caused by a broad spectrum of fungal plant pathogens in the Basidiomycete, Ascomycete, Oomycete and Deuteromycete classes. They are effective in controlling a broad spectrum of plant diseases, particularly foliar pathogens of ornamental, vegetable, field, cereal, and fruit crops. These pathogens include Plasmopara viticola, Phytophthora infestans, Peronospora tabacina, Pseudoperonospora cubensis, Pythium aphanidewnatum, Alternaria brassicae, Septoria nodorum, Cercosporidium personatum, Cercospora arachidicola, Pseudocercosporella herpotrichoides, Cercospora beticola, Botrytis cinerea, Monilinia fructicola, Pyricularia oryzae, Podosphaera leucotricha, Venturia inaequalis, Erysiphe graminis, Uncinula necatur, Puccinia recondita, Puccinia graminis, Hemileia vastatrix, Puccinia striiformis, Puccinia arachidis, Rhizoctonia solani, Sphaerothecafuliginea, Fusarium oxysporum, Verticillium dahliae, Pythium aphanidennatum, Phytophthora megasperma and other generea and species closely related to these pathogens.

Compounds of this invention can also be mixed with one or more other insecticides, fungicides, nematocides, bactericides, acaricides, semiochemicals, repellants, attractants, pheromones, feeding stimulants or other biologically active compounds to form a multi-component pesticide giving an even broader spectrum of agricultural protection. Examples of other agricultural protectants with which compounds of this invention can be formulated are: insecticides such as acephate, avermectin B, azinphosmethyl, bifenthrin, biphenate, buprofezin, carbofuran, chlordimeform, chlorpyrifos, cyfluthrin, deltamethrin, diazinon, diflubenzuron, dimethoate, esfenvalerate, fenpropathrin, fenvalerate, fipronil, flucythrinate, flufenprox, fluvalinate, fonophos, isofenphos, malathion, metaldehyde, metha-midophos, methidathion, methomyl, methoprene, methoxychlor, monocrotophos, oxamyl, parathion-methyl, permethrin, phorate, phosalone, phosmet, phosphamidon, pirimicarb, profenofos, rotenone, sulprofos, terbufos, tetrachlorvinphos, thiodicarb, tralomethrin, trichlorfon and triflumuron; fungicides such as benomyl, blasticidin S, bromuconazole, captafol, captan, carbendazim, chloroneb, chlorothalonil, copper oxychloride, copper salts, cymoxanil, cyproconazole, cyrodinil, dichloran, diclobutrazol, diclomezine, difenoconazole, diniconazole, dodine, edifenphos, epoxyconazole fenarimol, fenbuconazole, fenpropidine, fenpropimorph, fluquinconazole, flusilazol, flutolanil, flutriafol, folpet, furalaxyl, hexaconazole, ipconazole, iprobenfos, iprodione, isoprothiolane, kasugamycin, mancozeb, maneb, mepronil, metalaxyl, metconazole, myclobutanil, neo-asozin, oxadixyl, penconazole, pencycuron, phosethyl-Al, probenazole, prochloraz, propiconazole, pyrifenox, pyrimethanil, pyroquilon, sulfur, tebuconazole, tetraconazole, thiabendazole, thiophanate-methyl, thiuram, triadimefon, triadimenol, tricyclazole, triticonazole, uniconzole, validamycin and vinclozolin; nematocides such as aldoxycarb, fenamiphos and fosthietan; bactericides such as oxytetracyline, streptomycin and tribasic copper sulfate; acaricides such as amitraz, binapacryl, chlorobenzilate, cyhexatin, dicofol, dienochlor, fenbutatin oxide, hexythiazox, oxythioquinox, propargite and tebufenpyrad; and biological agents such as Bacillus thuringiensis and baculovirus.

In certain instances, combinations with other fungicides having a similar spectrum of control but a different mode of action will be particularly advantageous for resistance management. Preferred combinations comprise a compound of Formula I and a fungicide selected from the group flusilazole, cyproconazole, tetraconazole, fenpropimorph, fenpropidine, cymoxanil, benomyl, carbendazim, mancozeb, and maneb.

Plant disease control is ordinarily accomplished by applying an effective amount of a compound of this invention either pre- or post-infection, to the portion of the plant to be protected such as the roots, stems, foliage, fruit, seeds, tubers or bulbs, or to the media (soil or sand) in which the plants to be protected are growing. The compounds can also be applied to the seed to protect the seed and seedling.

The following TEST demonstrates the control efficacy of compounds of this invention on wheat powdery mildew. The pathogen control protection afforded by the compounds is not limited, however, to this pathogen.

Test compounds are first dissolved in acetone in an amount equal to 3% of the final volume and are then suspended at a concentration of 200 ppm in purified water containing 250 ppm of the surfactant Trem® 014 (polyhydric alcohol esters). The resulting test suspensions are then used in the following test.

TEST

The test suspension is sprayed to the point of run-off on wheat seedlings. The following day the seedlings are inoculated with a spore dust of Erysiphe graminis f. sp. tritici, (the causal agent of wheat powdery mildew) and incubated in a growth chamber at 20° C. for 7 days, after which disease ratings are made.

Control of wheat powdery mildew is observed in this test.

Claims

I claim:

1. A compound of Formula I ##STR7## or an N-oxide or agriculturally-suitable salt thereof; wherein:

n is 0-4;

Q is O or S;

R¹ is independently selected from the group C₁ -C₄ alkyl, C₁ -C₂ haloalkyl and halogen;

X is halogen;

Y is hydrogen or halogen;

provided that

(ii) when n is 0, Q is O R² is n-propyl, and Y is H, then X is F, Cl or I.

2. A compound of claim 1 having said Formula I, or an agriculturally-suitable salt thereof; wherein:

Q is O;

3. A compound of claim 2 wherein:

R¹ is selected from the group CH₃, CF₃ and halogen; and

4. A compound of claim 3 wherein:

X is Cl, Br, or I.

5. A compound of claim 4 wherein:

6. A compound of claim 5 which is selected from the group:

3-(cyclopropylmethyl)-6-iodo-2-propyloxy-4(3H)-quinazolinone,

3-(cyclopropylmethyl)-6,8-diiodo-2-propyloxy-4(3H)-quinazolinone

3-(cyclopropylmethyl)-6,8-dibromo-2-propyloxy-4(3H)-quinazolinone and

6-chloro-3-(cyclopropylmethyl)-2-propyloxy-4(3H)-quinazolinone.

7. A method for controlling plant diseases caused by fungal plant pathogens comprising applying to the plant or portion thereof to be protected, to the media in which the plant to be protected is growing, or to the plant seed or seedling to be protected an effective amount of a compound of Formula I: ##STR8## or an N-oxide or agriculturally-suitable salt thereof; wherein:

n is 0-4;

Q is O or S;

X is halogen;

Y is hydrogen or halogen;

provided that

(i) when n is 1 and R¹ is C₁ -C₄ alkyl or n is 2 and both R¹ are C₁ -C₄ alky, then at least one R¹ is attached to the cyclopropyl ring; and

(ii) when n is 0, Q is O, R² is n-propyl, and Y is H, then X is F, Cl or I.

8. A fungicidal composition comprising an effective amount of a compound of Formula I: ##STR9## or an N-oxide or agriculturally-suitable salt thereof; wherein:

n is 0-4;

Q is O or S;

X is halogen;

Y is hydrogen or halogen;

provided that

(ii) when n is 0, Q is O, R² is n-propyl, and Y is H, then X is F, Cl or I; and

at least one of (a) a surfactant, (b) an organic solvent, and (c) at least one solid or liquid diluent.

9. A method for controlling wheat powdery mildew comprising applying to the plant or portion thereof to be protected, to the media in which the plant to be protected is growing, or to the plant seed or seedling to be protected an effective amount of a compound of claim 1.