Solutions of 3-acetoxyaminoquinazolinone (5) react with enol ethers and silyl ketene acetals to give α-aminoaldehyde α-aminoketone or α-aminoacid derivatives. Acylation of the exocyclic nitrogen in these derivatives, as a preliminary to reductive NN bond cleavage, could only be accomplished by indirect means. Samarium diiodide, however, effected the reduction of this NN bond without the necessity
3-乙酰氧基
氨基
喹唑啉酮(5)的溶液与烯醇醚和甲
硅烷基
乙烯酮缩醛反应,得到α-
氨基醛α-
氨基酮或
α-氨基酸衍
生物。这些衍
生物中环外氮的酰化,作为还原性NN键断裂的先决条件,只能通过间接方式完成。然而,二
碘化可实现NN键的还原,而无需进行N-酰化。相应的对映体纯的3-乙酰氧基
氨基
喹唑啉酮(34)的溶液引起前手性甲
硅烷基
乙烯酮缩醛(15)的非对映选择性胺化,以及主要非对映异构体的还原性NN键裂解导致对映纯2-苯丙
氨酸甲酯。