Amination with 3-acetoxyaminoquinazolin-4-(3h)ones: preparation of α-aminoacid esters by reaction with silyl ketene acetals followed by NN bond cleavage
作者:Robert S. Atkinson、Brian J. Kelly、John Williams
DOI:10.1016/s0040-4020(01)90382-5
日期:1992.9
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。