strategy for the synthesis of 6-substituted-2-pyrone derivatives, by BF3·OEt2 mediated one pot cyclization and keto-protection of δ-hydroxy-β-keto esters, obtained via regioselective addition of 1,3-dicarbonyl dianion of ethyl acetoacetate to aldehydes and ketones is described.
一种简单有效的策略,通过BF 3 ·OEt 2介导的δ-羟基-β-
酮酯的一锅环化和酮保护,通过区域选择性添加1,3获得6-取代的2-
吡喃酮衍
生物描述了
乙酰乙酸乙酯的-二羰基二价阴离子对醛和酮。