7-氟-6-胺基-2H-1,4-苯并恶嗪-3(4H)-酮的合成

由1，5-二氟-2，4-二硝基苯为原料经醚化、还原合成7-氟-6-胺基-2H-1，4-苯并恶嗪-3(4H)-酮，产率为66.3％(以1，5-二氟-2，4-二硝基苯计)，产物经IR,^1HNMR证实了结构。该化合物是合成除草剂丙炔氟草胺(Flumioxaxin)的关键中间体。     

催化加氢合成6-氨基-7-氟-2H-1,4-苯并口恶嗪-3(4H)-酮

6-氨基-7-氟-2H-1,4-苯并口恶嗪-3(4H)-酮(Ⅱ)是合成除草剂丙炔氟草胺的关键中间体,该文采用雷尼镍催化加氢还原7-氟-6-硝基-2H-1,4-苯并口恶嗪-3(4H)-酮(Ⅰ)高收率的制得了目标化合物Ⅱ,确定了最佳合成工艺条件:反应温度80℃,反应时间5 h,催化剂用量为原料质量的5%,氢气压力6 MPa,产品的收率95.2%,质量分数98.5%,溶剂和催化剂循环使用5次,对收率和产品质量分数无影响。产品结构经元素分析、红外光谱、核磁共振确证。     

2-[7-氟-4-(3-碘-丙-2-炔基)-3-氧-3,4-二氢-2H-苯并(噁)嗪[b][1,4]-6-基]-4,5,6,7-四氢-2H-异吲哚-1,3-二酮的合成

标题化合物(B2055)是具有较高原卟啉原氧化酶抑制剂除草活性的N-苯基酞酰亚胺类新化合物,合成该化合物的关键步骤是2-[7-氟-4-(丙-2-炔基)-3-氧-3,4-二氢-2H-苯并噁嗪[b][1,4]-6-基]-4,5,6,7-四氢-2H-异吲哚-1,3-二酮(丙炔氟草胺,flumioxazin)的碘化。为寻求更经济和可工业化的合成路线,考察了不同的碘化剂、溶剂、原料配比、反应温度及反应时间对丙炔氟草胺的转化率和产品B2055收率的影响,在以醋酸为溶剂,氯化碘为碘化剂,原料丙炔氟草胺与氯化碘的物质的量比为1∶3,反应温度为20℃,反应时间为60 min的工艺条件下,原料丙炔氟草胺转化率为92.2%,产品B2055收率为90.7%。     

2-[7-氟-4-（3-碘-丙-2-炔基）-3-氧-3,4-二氢-2H-苯并嗯嗪[b][1,4]-6-基]-4,5,6,7-四氢-2H-异吲哚-1,3-二酮的合成

标题化合物（B2055）是具有较高原卟啉原氧化酶抑制剂除草活性的N-苯基酞酰亚胺类新化合物，合成该化合物的关键步骤是2-[7-氟-4-（丙-2-炔基）-3-氧-3，4-二氢-2H-苯并曝嗪[b][1，4]-6-基]-4，5，6，7-四氢-2H-异吲哚-1，3-二酮（丙炔氟草胺，flumioxazin）的碘化。为寻求更经济和可工业化的合成路线，考察了不同的碘化剂、溶剂、原料配比、反应温度及反应时间对丙炔氟草胺的转化率和产品B2055收率的影响，在以醋酸为溶剂，氯化碘为碘化剂，原料丙炔氟草胺与氯化碘的物质的量比为1：3，反应温度为20℃，反应时间为60min的工艺条件下，原料丙炔氟草胺转化率为92．2％，产品B2055收率为90．7％。     

催化加氢合成6-氨基-7-氟-2H-1,4-苯并(噁)嗪-3(4H)-酮

6-氨基-7-氟-2H-1，4-苯并噁嗪-3（4H）-酮（Ⅱ）是合成除草剂丙炔氟草胺的关键中间体，该文采用雷尼镍催化加氢还原7-氟-6-硝基-2H-1，4-苯并噁嗪-3（4H）-酮（Ⅰ）高收率的制得了目标化合物Ⅱ，确定了最佳合成工艺条件：反应温度80℃，反应时间5h，催化剂用量为原料质量的5％，氢气压力6MPa，产品的收率95．2％，质量分数98．5％，溶剂和催化剂循环使用5次，对收率和产品质量分数无影响。产品结构经元素分析、红外光谱、核磁共振确证。     

丙炔氟草胺合成新工艺

目前合成丙炔氟草胺的路线较多,但收率均不高。为了提高收率,降低成本,以2,4-二氟硝基苯为起始原料,经硝化、醚化、加氢还原关环、丙炔化、苯酐酰化等5步反应合成了丙炔氟草胺,每步收率均大于90%,总收率60%以上,含量98%以上。该路线原料易得,操作方便,易于工业化生产。     

37%丙炔氟·丙草悬乳剂的气相色谱分析

采用气相色谱法对37%丙炔氟·丙草悬乳剂中的丙炔氟草胺、丙草胺进行同柱分析和定量。结果表明,该方法中丙炔氟草胺、丙草胺的线性相关系数分别为0.999 4和0.999 6,标准偏差分别为0.06、0.21,变异系数分别为2.84%、0.59%,平均回收率分别为99.35%、99.03%。     

新型除草剂氟丁酰草胺的合成研究

以邻氟三氟甲苯等为初始原料,经硝化、还原、重氮化、水解得到4-氟-3-三氟甲基苯酚,然后与烷基化剂2-溴丁酸乙酯反应,得到2-(4-氟-3-三氟甲基苯氧基)丁酸乙酯,再与苄胺发生酰化反应,得到目标产物氟丁酰草胺,总收率52.3%。     

气相色谱法同时检测丙炔氟草胺和精异丙甲草胺在绿豆中的残留

[目的]为了监测丙炔氟草胺和精异丙甲草胺在绿豆等农产品中的残留及环境安全性评价,采用气相色谱仪建立了同时检测绿豆中丙炔氟草胺和精异丙甲草胺残留量的方法。[方法]样品中丙炔氟草胺和精异丙甲草胺残留先用二氯甲烷提取,再用二氯甲烷进行液-液分配,浓缩定容后用PSA和C-GCB净化,采用GC-ECD进行检测,色谱柱为DB-608。[结果]在0.05~5.0 mg/L的质量浓度范围内,丙炔氟草胺和精异丙甲草胺的峰面积与质量浓度之间呈现出良好的线性关系;在添加质量分数为0.05~2.0 mg/kg时,丙炔氟草胺和精异丙甲草胺在绿豆中的添加回收率分别为90%~105%和80%~94%,相对标准偏差分别为1.1%~3.1%和0.6%~2.6%。该方法的最小检出量(LOD)均为0.05 ng,丙炔氟草胺和精异丙甲草胺在绿豆中的最低检测浓度(LOQ)均为0.05 mg/kg。[结论]该方法具有灵敏度、精密度和准确度良好,杂质干扰少等特点,符合农药残留检测分析的基本要求。     

3-溴-4-三氟甲氧基苯酚的合成

以邻三氟甲氧基苯胺为原料经硝化、重氮化、还原和水解四步可得纯度≥99%(GC)的产物3-溴-4-三氟甲氧基苯酚,总产率26.2%。产物结构通过MS及1H NMR验证。     

6-氨基-7-氟-2H-1,4-苯并(噁)嗪-3(4H)-酮的高效液相色谱法测定

叙述了采用反向高效液相色谱法,以甲醇为溶剂,甲醇与水(体积比65∶35)为流动相,ODS为填料和紫外检测器分离测定6-氨基-7-氟-2H-1,4-苯并嗪-3(4H)-酮。该方法的标准偏差为0.29,变异系数为0.32%,回收率为99.85%,线性关系系数为0.9997。     

1-甲基-3-(7-氟-4-炔丙基-1,4-苯并噁嗪-3-酮-6-基)-1,3-喹唑啉-2,4-二酮的合成及其除草活性

标题化合物(SYP-298)是沈阳化工研究院的试验除草剂,由邻硝基苯甲酸经5步反应制得。其结构经核磁共振谱和质谱分析确证。SYP-298在温室条件下38 g a.i./hm2可防多种阔叶杂草,在600 g a.i./hm2对玉米和水稻安全。     

1-[7-氟-4-炔丙基-1，4-苯并噁嗪-3-酮-6-基]-3-正丙基-2-硫代咪唑啉三酮的合成及其除草活性

标题化合物(SYP-300)是沈阳化工研究院的试验除草剂。由丙基异硫氰酸酯与6-氨基-7-氟-4-炔丙基-1，4-苯并噁嗪-3-酮经两步反应制得。其结构经核磁共振谱、红外光谱和元素分析确证。SYP-300在温室条件下100ga．i．／hm^2可防除多种阔叶杂草，在200ga．i．／hm^2对小麦和水稻安全。     

1-[7-氟-4-炔丙基-1,4-苯并嗪-3-酮-6-基]-3-正丙基-2-硫代咪唑啉三酮的合成及其除草活性

标题化合物(SYP-300)是沈阳化工研究院的试验除草剂。由丙基异硫氰酸酯与6-氨基-7-氟-4-炔丙基-1,4-苯并嗪-3-酮经两步反应制得。其结构经核磁共振谱、红外光谱和元素分析确证。SYP-300在温室条件下100ga.i./hm2可防除多种阔叶杂草,在200ga.i./hm2对小麦和水稻安全。     

雷尼镍催化加氢合成7-氟-2H-1,4苯并噁嗪-3(4H)-酮

研究了雷尼镍为催化剂加氢还原2-(5-氟-2-硝基苯氧基)乙酸甲酯(1)合成7-氟-2H-[1,4]苯并噁嗪-3(4H)-酮(2)的方法,使还原、合环一次完成。考察了反应温度、催化剂、氢气压力、时间、溶剂及回收的催化剂和溶剂对反应收率的影响,确定了合成工艺条件:反应温度70℃,反应时间4h,催化剂用量为原料质量的5%,氢气压力5MPa,溶剂甲醇用量为1000mL/mol1。产品的收率92.4%,含量98%,溶剂和催化剂循环使用4次,对收率无影响。产品结构经元素分析、红外光谱、核磁共振确证。     

Soil transformation of wheat and corn metabolites mboa and DIM2BOA into aminophenoxazinones

The defensive cyclic hydroxamates 7-methoxy-2,4-dihydroxy-1,4(2H)-benzoxazin-3-one (DIMBOA) and 7,8-dimethoxy-2,4-dihydroxy-1,4(2H)-benzoxazin-3-one (DIM₂BOA) of wheat and corn are transformed in nonsterile soil, via 6-methoxy-2(3H)-benzoxazolone (MBOA) and 6,7-dimethoxy-2(3H)-benzoxazolone (M₂BOA) respectively, into 2-amino-7-methoxy-3H-phenoxazin-3-one and 2-amino-4,6,7-trimethoxy-3H-phenoxazin-3-one. The soil transformation is similar of that undergone by the rye metabolite 2(3H)-benzoxazolone (BOA) into 2-amino-3H-phenoxazin-3-one. The transformations to phenoxazinones are not observed in sterile soil. The 2-amino-3H-phenoxazin-3-one inhibits barnyard grass radicle elongation, but the methoxylated aminophenoxazinones are not significantly inhibitory.     

Hydroxamic Acid Content and Toxicity of Rye at Selected Growth Stages

Rye (Secale cereale L.) is an important cover crop that provides many benefits to cropping systems including weed and pest suppression resulting from allelopathic substances. Hydroxamic acids have been identified as allelopathic compounds in rye. This research was conducted to improve the methodology for quantifying hydroxamic acids and to determine the relationship between hydroxamic acid content and phytotoxicity of extracts of rye root and shoot tissue harvested at selected growth stages. Detection limits for an LC/MS-MS method for analysis of hydroxamic acids from crude aqueous extracts were better than have been reported previously. (2R)-2-β-d-Glucopyranosyloxy-4-hydroxy-(2H)-1,4-benzoxazin-3(4H)-one (DIBOA-G), 2,4-dihydroxy-(2H)-1,4-benzoxazin-3(4H)-one (DIBOA), benzoxazolin-2(3H)-one (BOA), and the methoxy-substituted form of these compounds, (2R)-2-β-d-glucopyranosyloxy-4-hydroxy-7-methoxy-(2H)-1,4-benzoxazin-3(4H)-one (DIMBOA glucose), 2,4-hydroxy-7-methoxy-(2H)-1,4-benzoxazin-3(4H)-one (DIMBOA), and 6-methoxy-benzoxazolin-2(3H)-one (MBOA), were all detected in rye tissue. DIBOA and BOA were prevalent in shoot tissue, whereas the methoxy-substituted compounds, DIMBOA glucose and MBOA, were prevalent in root tissue. Total hydroxamic acid concentration in rye tissue generally declined with age. Aqueous crude extracts of rye shoot tissue were more toxic than extracts of root tissue to lettuce (Lactuca sativa L.) and tomato (Lycopersicon esculentum Mill.) root length. Extracts of rye seedlings (Feekes growth stage 2) were most phytotoxic, but there was no pattern to the phytotoxicity of extracts of rye sampled at growth stages 4 to 10.5.4, and no correlation of hydroxamic acid content and phytotoxicity (I₅₀ values). Analysis of dose–response model slope coefficients indicated a lack of parallelism among models for rye extracts from different growth stages, suggesting that phytotoxicity may be attributed to compounds with different modes of action at different stages. Hydroxamic acids may account for the phytoxicity of extracts derived from rye at early growth stages, but other compounds are probably responsible in later growth stages.     

1-(4-溴苯基)-3-(1H-1,2,4-三氮唑-3-基)脲的合成

以4-溴苯甲酸为原料,经过Curtius重排反应制得4-溴苯异氰酸酯,再进一步与3-氨基-1H-1,2,4-三氮唑发生亲核加成反应,合成了目标产物1-(4-溴苯基)-3-(1H-1,2,4-三氮唑-3-基)脲。对产物进行了元素分析,以红外、核磁和紫外光谱确认其结构;生测结果表明该化合物具有一定的植物生长调节活性。