A Synthetic Application of β-Aminoalanines to Some New 5-Dialkylaminomethyl-3-phenylhydantoin Derivatives
                                
                                    
                                        作者:Kunihiro Sumoto、Fumiko Fujisaki、Kaori Shoji                                    
                                    
                                        DOI:10.3987/com-08-11519
                                    
                                    
                                        日期:——
                                    
                                    (3) were synthesized from β-aminoalanines (1) as the starting materials in two stages. Intermediate urea derivatives (2) prepared from the addition reaction of β-aminoalanines to phenyl isocyanate are easily cyclized to 5-dialkylaminomethylhydantoins (3) with good yields. The deamination reaction of some of the hydantoin derivatives (3a, 3b) in water were observed and resulted in the formation of 
                                    5-二烷基
氨基甲基乙内酰
脲(3)以β-
氨基丙
氨酸(1)为起始原料分两步合成。由 β-
氨基丙
氨酸与
异氰酸苯酯的加成反应制备的中间
脲衍
生物 (2) 很容易以良好的收率环化为 5-二烷基
氨基甲基乙内酰
脲 (3)。观察到一些乙内酰
脲衍
生物 (3a, 3b) 在
水中的脱
氨反应并导致形成 3-苯基-5-亚甲基乙内酰
脲 (4)。乙内酰
脲衍
生物(3b)通过用过量的
吡咯烷或
哌啶处理再生
尿素衍
生物(2c,d)。