Process for producing (4E)-5-chloro-2-isopropyl-4-pentenoate and optically active form thereof
申请人:Mori Nobuaki
公开号:US20050228193A1
公开(公告)日:2005-10-13
The present invention provides processes for producing a (4E)-5-chloro-2-isopropyl-4-pentenoate and an optical isomer of the (4E)-5-chloro-2-isopropyl-4-pentenoate, namely a process for producing a (4E)-5-chloro-2-isopropyl-4-pentenoate represented by the following formula (4), which comprises reacting a compound represented by the following formula (2) in the presence of an aprotic solvent (II) with a base (II) and then with (1E)-1,3-dichloro-1-propene to give a compound represented by the following formula (3), and dealkoxycarbonylating either ester in the compound represented by the following formula (3), and a process for producing a (S)-(4E)-5-chloro-2-isopropyl-4-pentenoate represented by the following formula (5), which comprises optically resolving a (4E)-5-chloro-2-isopropyl-4-pentenoate represented by the formula (4) obtained by the above-mentioned process (wherein R is a lower alkyl group or an aralkyl group).
本发明提供了生产(4E)-5-氯-2-异丙基-4-戊烯酸酯和(4E)-5-氯-2-异丙基-4-戊烯酸酯光学异构体的工艺、即生产下式(4)所代表的(4E)-5-氯-2-异丙基-4-戊烯酸酯的工艺,该工艺包括在有壬烷溶剂(II)存在下,将下式(2)所代表的化合物与碱(II)反应,然后与(1E)-1、3-二氯-1-丙烯反应,得到下式(3)所代表的化合物,并将下式(3)所代表的化合物中的任一酯脱烷氧基羰基化,以及生产下式(5)所代表的(S)-(4E)-5-氯-2-异丙基-4-戊烯酸酯的工艺、其中包括对通过上述工艺获得的式 (4) 所代表的 (4E)-5-氯-2-异丙基-4-戊烯酸酯进行光学解析(其中 R 为低级烷基或芳烷基)。