| English term or phrase: recovering | 1. A process for resolving trans racemic (±) (4S,6S; 4R,6R)-4-(Ethylamino)-5,6-dihydro-6-methyl-4H-thieno[2,3-b]thiopyran-2-sulfonamide 7,7-dioxide (dorzolamide trans racemate), of formula (II)
characterized by:
a) reacting said racemate with (1S)-(+)-10-camphorsulfonic acid of formula
b) obtaining the (4S, 6S) enantiomer by selectively precipitating and recovering the camphorsulfonic acid salt thereof (dorzolamide camphorsulfonate) of formula (III)
and
c) neutralizing dorzolamide camphorsulfonate of formula (III) to obtain dorzolamide of formula (I) |
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