Exploring O-stannyl ketyl and acyl radical cyclizations for the synthesis of γ-lactone-fused benzopyrans and benzofurans
作者:Helen Santoso、Myriam I. Casana、Christopher D. Donner
DOI:10.1039/c3ob42090f
日期:——
The synthesis of a series of γ-lactone-fused benzopyrans and benzofurans, analogues of the pyranonaphthoquinone antibiotics, is reported. Preparation of the heterocycles was achieved by either O-stannyl ketyl or acyl radical cyclization of benzaldehyde precursors followed by oxidation to give the pyrano- and furanobenzoquinone systems. The observed diastereoselectivity during O-stannyl ketyl radical
据报道,合成了一系列γ-内酯融合的苯并吡喃和苯并呋喃,它们是吡喃并萘醌抗生素的类似物。杂环的制备是通过苯甲醛前体的O-锡烷基酮基或酰基自由基环化,然后氧化得到吡喃基和呋喃基苯醌体系而实现的。O-锡烷基酮基自由基环化过程中观察到的非对映选择性受醛的芳族取代邻位的影响,而酰基自由基环化然后立体选择性还原所得吡喃酮提供了形成所需的γ-内酯融合的苯并吡喃体系的补充方法。