Method of preparation of lower alkyl 4,10-...

Details Method of preparation of lower alkyl 4,10-... Method of preparation of lower alkyl 4,10-...

C - Chemistry, Metallurgy

07

D

260/328.3

C07D 495/04 (2006.01)

Patent

CA 1140138

HOE 79/F 114 A METHOD OF PREPARATION OF LOWER ALKYL 4,10-DIHYDRO- 10-OXOTHIENO[3,2-c][1]BENZOXEPIN-8-ACETATE Abstract of the disclosure: Lower alkyl 4,10-dihydro-10-oxothieno[3,2-c][1]- benzoxepin-8-acetate is synthesized from 4-(2-carboxy-3- thienylmethoxy)phenylacetic acid by a process comprising acid halide formation, ring closure catalyzed by aluminum trihalide and esterification with a lower alcohol. The three reaction steps are carried out successively in the same reactor without any isolation or purification of intermediate products and a surprisingly high overall yield is obtained additionally, significant advantages in terms of environmental pollution and waste water costs are achieved.

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