A radical cyclisation strategy to α-spiro-β-methylene-γ-butyrolactones. Total synthesis of (±)-norbakkenolide-A
作者:Adusumilli Srikrishna、Sankuratri Nagaraju、G. Veera Raghava Sharma
DOI:10.1039/c39930000285
日期:——
The 5-exo-dig radical cyclisation reaction of the bromoacetals 9, obtained from the enol ethers 8, and treatment of the resulting hemiacetal 10 with JonesⲠreagent transforms the cyclic ketones 7 and 12 into α-spiro-β-methylene-γ-butyrolactones 11 and norbakkenolide-A 2.
通过烯醇醚 8 得到的溴乙醛 9 的 5-exo-dig 自由基环化反应,以及用 Jonesâ² 试剂处理得到的半缩醛 10,可将环状酮 7 和 12 转化为 δ-螺δ-亚甲基δ-丁内酯 11 和去甲斑蝥内酯-A 2。