(5R)-1-Benzyl-5-methyl-1,4-diazepane

(R)-4-benzyl-7-methyl-1,4-diazepan-2,5-dione(6 mmol)Was dissolved in 60 ml of dry THF, and 1.35 g of LiAlH4 (36 mmol) was added portionwise under ice-cooling, and stirred at 25℃ for 4 h.After cooling to -10 ℃, 1.5 ml of H20 was added and 1.5 ml of 15% NaOH, 4.5 ml of H20 and a portion of MgS04 were added, stirred for 1 h, suction filtered and dried to afford 1.2 g of an oil yield 97.56%。