HCID 23114101, compound → HCID 52935173, compound

Participants

Reaction Conditions

Reaction Steps

A suspension of 3-(4-isopropylphenyl)-4,6-dimethyl-2,3-dihydro-1-benzofuran-5-amine obtained in Reference Example 32 (22.5 g, 80 mmol) and (2S, 3S)-(4′-methyl)-tartranilic acid (19.14 g, 80 mmol) in ethanol (480 mL) was heated at 85° C. for dissolution. The solution was cooled to 0° C. for 2 hours, and the precipitated crystals were taken. The crystals were washed with cold ethanol, and then were dried under reduced pressure. The obtained crystals were suspended in a 2 N aqueous sodium hydroxide solution (400 mL), which was extracted with diethyl ether. The extract was washed with a saturated sodium hydrogen carbonate solution and a saturated brine, and then was dried over sodium sulfate. The solvent was distilled off under reduced pressure to obtain 9.44 g (yield 34%) of the title compound as an oily matter. The obtained oily matter was, if necessary, crystallized with cold hexane. Melting point: 53-55° C. [α]D20=+64.0° (c=0.44, chloroform).

Provenance & Evidence