Construction of Aromatic [5,5] Spiroketals via Hypoiodite-Catalyzed Etherification Combined in Relay Cascades
摘要:
An approach is developed for the synthesis of bisbenzannelated spiro[5,5]ketals via a catalytic relay reaction cascade involving a new cycloetherification, which is prompted by fluoride and catalyzed by the hypoiodite species generated in situ from irradiative aerobic oxidation of an iodide ion formed in the former step of the reaction cascade.
Organohalogenite-Catalyzed Spiroketalization: Enantioselective Synthesis of Bisbenzannulated Spiroketal Cores
作者:Jijun Xue、Hongrui Zhang、Tian Tian、Keshu Yin、Dongxue Liu、Xianxing Jiang、Ying Li、Xiaojie Jin、Xiaojun Yao
DOI:10.1002/adsc.201500390
日期:2016.2.4
found and used for the enantioselective synthesis of bisbenzannulated spiroketals, the bioactive core of rubromycins, with high levels of enantioselectivity (up to 98% ee) via an organohalogenite‐mediated asymmetric intramolecular aromatic spiroketalization. This is the first organocatalytic method for the construction of optically pure bisbenzannulated spiroketals.