HCID 67399201、化合物 → HCID 67396216、化合物

To a suspension of 2-{[4-(carboxymethyl)-1,3-thiazol-2-yl]thio}-2-methylpropionic acid resin (10 g) synthesized in Example 461-4 in tetrahydrofuran (50 mL) was added 1 mol/L borane-tetrahydrofuran complex (25 ml) under ice-cooling, and the mixture was stirred at room temperature overnight. The resin was collected by filtration from the reaction mixture, washed twice with tetrahydrofuran-methanol (1:1) solution, three times with tetrahydrofuran, twice with methanol, once with piperidine, once with tetrahydrofuran and once with methanol in this order, and vacuum dried. To this resin was added 1 mol/L borane-tetrahydrofuran complex (25 ml) again, and the mixture was stirred at room temperature overnight. The resin was collected by filtration from the reaction mixture, washed once each with tetrahydrofuran, tetrahydrofuran-methanol (1:1) solution and tetrahydrofuran-piperidine (1:1) solution, then washed three times each with tetrahydrofuran and methanol, and vacuum dried to give the title pale-yellow resin (8.6 g).