An anhydride-promoted [4+2] cyclization of easily available 2-(hydroxymethyl)phenols with amides was reported, providing a practical way to the synthesis of novel highly steric 3,3′-bis-substituted 4H-benzo[e][1,3]oxazines as well as bis(benzo[e][1,3]oxazines).
报道了酸酐促进的2- [羟甲基]
苯酚与酰胺的酸酐促进的[4 + 2]环化,为合成新型高度立体的3,3'-双取代的4 H-苯并[ e ]提供了一种实用的方法。[1,3]恶嗪以及双(苯并[ e ] [1,3]恶嗪)。