Short Flow-Photochemistry Enabled Synthesis of the Cytotoxic Lactone (+)-Goniofufurone
作者:Michael Ralph、Sean Ng、Kevin I. Booker-Milburn
DOI:10.1021/acs.orglett.6b00067
日期:2016.3.4
A photochemical approach to the cytotoxic lactone (+)-goniofufurone (1) is reported. Paternò–Büchi [2 + 2] photocycloaddition from known enol ether 4, derived from the readily available sugar d-isosorbide, yielded oxetane 7. This slow, dilute reaction was scaled up by using flow photochemistry to yield >40 g of 7. Installation of the key lactone ring was achieved via a unique Wacker-style oxidation
报道了光化学方法对细胞毒性内酯(+)-gonfufufurone(1)的作用。从已知的烯醇醚4衍生出的Paternò–Büchi [2 + 2]光环加成反应是从易得的糖d-异山梨醇衍生而来的,其产生的是氧杂环丁烷7。通过使用流式光化学法可将这种缓慢,稀薄的反应扩大规模,以产生> 40 g的7。关键内酯环的安装是通过独特的Wacker型烯醇醚键氧化来实现的。酸催化的水性开环从4个步骤(共11.5%)中分五个步骤提供了1个步骤。