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11-OXO-6,11-DIHYDRO-DIBENZOB,EOXEPINE-2-CARBOXYLIC ACID METHYL ESTER synthesis

4synthesis methods
66801-40-9 Synthesis
Olopatadine Impurity 1

66801-40-9
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Yield:-

Reaction Conditions:

with sulfuric acid in methanol;

Steps:

21 Methyl 6,11-Dihydro-11-oxodibenz[b,e]oxepin-2-carboxylate

EXAMPLE 21 Methyl 6,11-Dihydro-11-oxodibenz[b,e]oxepin-2-carboxylate Reflux 8 gm. of 6,11-dihydro-11-oxodibenz[b,e]oxepin-2-carboxylic acid in 600 cc. of methanol containing 1 cc. of sulfuric acid for 19 hours. Cool and separate the solids by filtration to obtain the title product. (m.p. 130°-131° C.). To obtain an additional crop, add excess sodium bicarbonate to the filtrate, evaporate to dryness and extract the residue with chloroform.

References:

US4282365,1981,A

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