氨甲酰基硅烷作氨酰基源与邻位二酮选择性氨酰化反应合成α-羟基-β-羰基仲(伯)酰胺衍生物

Efficient Synthesis of β-Keto-α-hydroxy Secondary(Primary)Amides by Selective Aminocarbonylation of Vicinal Diketones Using Carbamoylsilane as an Amide Source

几种氨甲酰基硅烷与邻位二酮在无催化剂和氧化剂的温和条件下直接发生选择性氨酰化反应,制备了α-硅氧基-β-羰基仲(伯)酰胺衍生物,收率为62%~90%.氨甲酰基硅烷和邻位二酮的结构的空间位阻都影响在两个羰基上的反应选择性.氨基保护基甲氧甲基和苄基容易脱保护基转化成氢原子,得到α-羟基-β-羰基仲(伯)酰胺衍生物.通过选择不同氨甲酰基硅烷进行反应发现,此方法是选择性合成α-羟基-β-羰基叔酰胺、仲酰胺和伯酰胺衍生物的简易方法.该反应具有条件温和、副产物少、选择性強、产物得率高和后处理简单等优点,是有效合成α-羟基-β-羰基酰胺衍生物的新方法.

The selective aminocarbonylation of vicinal diketones using carbamoylsilane as an amide source affordsβ-keto-α-siloxyamide derivatives in 62%~90%yields under mild conditions without using any oxidants and catalysts.The steric hindrance,which is both from the groups of vicinal diketones and the carbamoylsilanes,affects reaction selectivity on two carbonyl groups.The methoxymethyl or benzyl used as an amino protecting group,can be easily converted into hydrogen atom leading toβ-keto-α-hydroxy secondary or primary amides.The simple procedure allows the preparation of variousβ-keto-α-hydroxy amide derivatives including primary,secondary and tertiaryβ-keto-α-hydroxy amide derivatives.The reaction has the advantages of mild conditions,less by-products,high selectivity,good yield and simple post-treatment,and it is a new method for the efficient preparation ofβ-keto-α-hydroxyamides.