DBU-Mediated Dimerization: Facile Access to 9,9′-Bifluorenylidenes and Isoindigos
作者:Jatuporn Meesin、Nitchakan Purahong、Sakchai Hongthong、Nawasit Chotsaeng、Chutima Kuhakarn
DOI:10.1055/a-2158-7980
日期:2023.12
The present work describes the 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)-promoted self-dimerization of 9-chlorofluorenes and 3-chlorooxindoles for the preparation of the corresponding 9,9′-bifluorenylidene and isoindigo derivatives in moderate to good yields of 29–97%. The reactions proceed readily in a short reaction time under mild and metal-free conditions. Scale-up syntheses (5.0 mmol) of selected
目前的工作描述了 1,8-二氮杂双环[5.4.0]十一碳-7-烯 (DBU) 促进的 9-氯芴和 3-氯羟吲哚的自二聚反应,用于制备相应的 9,9'-二芴基和异靛蓝衍生品的收益率为 29-97%。该反应在温和且无金属的条件下在短反应时间内容易地进行。选定的 9,9'-亚二芴衍生物的放大合成(5.0 mmol)以良好的产率进行,突出了所报告方案的合成效用。