申请人:Roussel Uclaf
公开号:US04642372A1
公开(公告)日:1987-02-10
A process for the preparation of cyclopropane carboxylic acid derivatives of the formula ##STR1## wherein Z is selected from the group consisting of --CN, --COOH and --COOR.sub.1, R.sub.1 is alkyl of 1 to 6 carbon atoms and R.sub.2 and R.sub.3 are alkyl of 1 to 4 carbon atoms or taken together with the carbon atom to which they are attached form a carbon homocycle of 3 to 6 carbon atoms comprising reacting at low temperatures in a solvent in the presence of a strong base a compound of the formula ##STR2## wherein Z has the above definitions and R is alkyl of 1 to 6 carbon atoms or together form a polymethylene of 2 to 3 carbon atoms with a sulfone of the formula ##STR3## wherein R.sub.2 and R.sub.3 have the above definitions and Y is an aromatic group followed by aqueous treatment to obtain a compound of the formula ##STR4## wherein Y, R, R.sub.2, R.sub.3 and Z have the above definitions, reacting the latter at a low temperature in a solvent with a strong base while letting the temperature rise to obtain a compound of the formula ##STR5## wherein R, R.sub.2, R.sub.3 and Z have the above definitions of the cis/trans configuration richer in the trans isomer and either reacting the latter when Z is --CN or --COOR.sub.1 with a strong base in an aqueous media followed by acidification to obtain a compound of the formula ##STR6## wherein R, R.sub.2 and R.sub.3 have the above definitions having the same configuration as the compound of formula V or reacting the compound of formula V or Va with an acid agent in an aqueous media to obtain the corresponding compound of formula I with the same configuration as the compound of formula V or Va and optionally treating the latter with a weak base at room temperature to obtain the compound of formula I with a trans configuration which are valuable intermediates for the preparation of esters of cyclopropane carboxylic acid having elevated insecticidal activity.
一种制备环丙烷羧酸衍生物的方法,其化学式为##STR1##其中Z选择自--CN,--COOH和--COOR.sub.1的群组,R.sub.1是1至6个碳原子的烷基,R.sub.2和R.sub.3是1至4个碳原子的烷基或与它们附着的碳原子形成3至6个碳原子的碳同族环,包括在强碱存在下,在低温下在溶剂中反应化合物##STR2##其中Z具有上述定义,R是1至6个碳原子的烷基,或共同形成2至3个碳原子的聚亚甲基与化学式##STR3##的磺酰基反应,其中R.sub.2和R.sub.3具有上述定义,Y是芳香族基,然后进行水处理以获得化合物##STR4##其中Y,R,R.sub.2,R.sub.3和Z具有上述定义,在溶剂中与强碱反应,同时让温度升高以获得化合物##STR5##其中R,R.sub.2,R.sub.3和Z具有上述定义的顺反异构体,富含反异构体,并在Z为--CN或--COOR.sub.1时将后者与强碱在水介质中反应,随后酸化以获得化合物##STR6##其中R,R.sub.2和R.sub.3具有上述定义,具有与化合物V的化学式相同的构型,或将化合物V或Va与酸性试剂在水介质中反应,以获得与化合物V或Va的化学式相同的化合物I,并可选择在室温下用弱碱处理后获得具有反式构型的化合物I,这些化合物是制备具有升高杀虫活性的环丙烷羧酸酯的有价值的中间体。