Triethylamine → 3-[(-)-camphanoyl]-5-[1-(3,4-methylenedioxybenzoyl)-1,2,3, 4-tetrahydroquinol-6-yl]-6-methyl-3,6-dihydro-2H-1,3,4-thiadiazin-2-one

Participants

Reaction Steps

A solution of 26 g of (-)-camphanic acid chloride in 100 ml of methylene chloride is added dropwise at 0°, with stirring, to a suspension of 48 g of 5-[1- (3,4-methylenedioxybenzoyl)-1,2,3, 4-tetrahydroquinol-6- yl]-6-methyl-3,6-dihydro-2H-1,3,4-thiadiazin-2-one in 800 ml of methylene chloride to which 20 ml of triethylamine have been added, and the reaction mixture is stirred for 4 hours. It is then washed with dilute hydrochloric acid and subsequently with bicarbonate solution. The organic phase is separated off and worked up in conventional manner to give 3-[(-)-camphanoyl]-5-[1-(3,4-methylenedioxybenzoyl)-1,2,3, 4- tetrahydroquinol-6-yl]-6-methyl-3,6-dihydro-2H-1,3,4- thiadiazin-2-one as a mixture of diastereoisomers, m.p. 216°-217° .

Provenance & Evidence