Regioselective Synthesis of Fluorinated Phenols, Biaryls, 6H-Benzo[c]chromen-6-ones and Fluorenones Based on Formal [3+3] Cyclizations of 1,3-Bis(silyl enol ethers)
Metal‐Free, Base‐Promoted, Tandem Pericyclic Reaction: A One‐Pot Approach for Cycloheptane‐Annelated Chromones from γ‐Alkynyl‐1,3‐Diketones
作者:Yi‐En Liang、Chih‐Yu Kan、Balaji D. Barve、Yao‐Haur Kuo、Hsu‐Wei Fang、Wen‐Tai Li
DOI:10.1002/adsc.202100956
日期:2022.1.18
A microwave-assisted, base-promoted, tandem cyclization reaction strategy has been developed for the synthesis of cyclohepta[b]chromones and spiro cyclohepta[b]chromones. Readily accessible γ-alkynyl-1,3-diketones undergo intramolecular cyclization and 7-endo-trig carbocyclization to afford various cycloheptane-annelated chromones in one-potreactions. This metal-free protocol also led to the generation
已经开发了一种微波辅助、碱促进的串联环化反应策略,用于合成环庚[ b ]色酮和螺环庚[ b ]色酮。容易获得的 γ-alkynyl-1,3-diketones 经历分子内环化和 7- endo - trig碳环化,在一锅反应中提供各种环庚烷-annelated 色酮。这种无金属协议还导致产生具有新的 C-C 键和新的 C-O 键的多环。