反应详情

In the same manner as that in Step 2 of Reference Example 20, from another diastereomer of N-[4-acetyl-5-(2-methanesulfonylaminoethyl)-5-phenyl-4,5-dihydro-1,3,4-thiadiazol-2-yl]-2-phenylpropanamide (0.632 g, 1.33 mmol) eluted later obtained in Step 3 mentioned above, cerium chloride heptahydrate (0.496 g, 1.33 mmol) and sodium borohydride (0.503 g, 13.3 mmol), optically active N-[2-(3-acetyl-5-amino-2-phenyl-2,3-dihydro-1,3,4-thiadiazol-2-yl)ethyl]methanesulfonamide (232 mg, 51%) was obtained.

1. customobtained in Step 3