2-Isocyanatosulfonylbenzoic acid esters of the general formula
wherein R is selected from various hydrocarbyl and substituted hydrocarbyl groups;
R2 is H, Cl, Br, F, C1-C3 alkyl, -NO2, -OCH3, -SCH3, CF3, SO2CH3, N(CH3)2, CN, or 4-N=C=O; and
R3 is H, Cl, Br or CH3 with the proviso that when R is other than C3-C10 alkynyl, then R2 must be 4-NCO. are novel intermediates for the preparation of herbicidal ureas. The isocyanates may be prepared e.g. by reacting a corresponding 2-sulfamoylbenzoate ester of general formula
wherein R2' is NH2 or R2 as defined above, with a hydrocarbyl isocyanate and phosgene in the presence of a catalytic amount of a tertiary amine base and an inert solvent.
通式为 2-异
氰酸基磺酰基
苯甲酸酯
其中 R 选自各种烃基和取代的烃基;
R2 是 H、Cl、Br、F、C1-C3 烷基、-
NO2、-O 、-S 、
CF3、SO2 、N(
CH3)2、CN 或 4-N=C=O;以及
R3 是 H、Cl、Br 或 ,但当 R 不是 C3-C10 烷基时,R2 必须是 4-NCO。
异氰酸酯可通过与通式如下的相应 2-
氨基磺酰基
苯甲酸酯反应来制备
其中 R2' 为 NH2 或如上定义的 R2,与烃基
异氰酸酯和
光气在催化量的叔胺碱和惰性 溶剂存在下反应。