苯嘧磺草胺的合成路线有哪些？

基本信息：中文名称 苯嘧磺草胺中文别名 嘧啶肟草醚;N'-[2-氯-4-氟-5-(3-甲基-2,6-二氧-4-(三氟甲基)-3,6-二氢-1(2H)-嘧啶)苯甲酰]-N-异丙基-N-甲基硫酰胺;英文名称 Saflufenacil英文别名 N'-{2-chloro-4-fluoro-5-[1,2,3,6-tetrahydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)pyrimidin-1-yl]benzoyl}-N-isopropyl-N-methylsulfamide;benmihuangcaoan;Pyridine,2-chloro-5-[[(tetrahydro-2H-pyran-2-yl)oxy]methyl];2-chloro-4-fluoro-5-[3-methyl-2,6-dioxo-4-(trifluoromethyl)pyrimidin-1-yl]-N-[methyl(propan-2-yl)sulfamoyl]benzamide;2-chloro-5-[(tetrahydro-2-pyranyloxy)methyl]pyridine;2-chloro-5-[3,6-dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-4-fluoro-N-[[methyl(1-methylethyl)amino]sulfonyl]benzamide;2-chloro-5-(tetrahydropyran-2-yl)oxymethylpyridine;(rac)-2-chloro-5-[(tetrahydro-2H-pyran-2-yloxy)methyl]-pyridine;2-chloro-4-fluoro-5-[3-methyl-2,6-dioxo-4-(trifluoromethyl)-3,6-dihydropyrimidin-1(2H)-yl]-N-[methyl(propan-2-yl)sulfamoyl]benzamide;CAS号 372137-35-4合成路线：1.通过硫酸二甲酯合成苯嘧磺草胺，收率约86%；2.通过3-甲基氨基-4,4,4-三氟丁烯酸乙酯合成苯嘧磺草胺，收率约45%；更多路线和参考文献可参考http://baike.molbase.cn/cidian/1600827