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 radicalcyclization of benzaldehyde precursors followed by oxidation to give the pyrano- and furanobenzoquinone systems. The observed diastereoselectivity during O-stannyl ketyl radical
Radical Conjugate Addition of Aryl-Tethered β-Alkoxyacrylates: Formal Synthesis of (±)-Frenolicin B and (±)-epi-Frenolicin B
作者:Christopher Donner
DOI:10.1055/s-0029-1217118
日期:2010.2
The radical conjugate addition of aromatic-tethered O-stannyl ketyl radicals to β-alkoxyacrylates is demonstrated for the preparation of benzopyran-γ-lactone-fused tricyclic systems. This method is then applied to the stereodivergent formal synthesis of the kinase inhibitor (±)-frenolicin B and (±)-epi-frenolicin B.
芳香族束缚的 O-甲锡烷基自由基与 β-烷氧基丙烯酸酯的自由基共轭加成被证明可用于制备苯并吡喃-γ-内酯稠合三环系统。然后将该方法应用于激酶抑制剂 (±)-frenolicin B 和 (±)-epi-frenolicin B 的立体分歧形式合成。