A practical strategy has been developed for preparation of α-aryl ester derivatives by using a visible-light-induced Meerwein cascadereaction. This method uses molecular oxygen as an oxidant at room temperature without the need of hazardous reagents or harsh reaction conditions and provides a straightforward approach to pharmaceutically and synthetically useful α-aryl esters in moderate to good yields
Acid-catalyzed oxidation of alkyl- and benzyl-substituted β-diketones by hydrogen peroxide at 79-120 ˚C in a mixture of an alcohol and a strong acid (sulfuric acid, tetrafluoroboric acid, or perchloric acid) gave the corresponding esters through the formation of bridged 1,2,4,5-tetraoxanes. esters - hydrogen peroxide - oxidations - tetraoxanes - ketones
Synthesis of Diazo Compounds by Using NaN
<sub>3</sub>
and Inexpensive SO
<sub>2</sub>
F
<sub>2</sub>
作者:Cuijiao Ye、Zhaohua Yan、Guanghui Chen、Hongyan Xie、Minxiang Zhang、Sen Lin
DOI:10.1002/ejoc.202200584
日期:2022.11.18
AbstractA concise and efficient method was developed in which sodium azide (NaN3) and sulfuryl fluoride (SO2F2) were directly employed to synthesize diazo compounds with active methylene compounds. A variety of diazo compounds were produced in good to excellent yields. This protocol avoids the use of organosulfonyl azides, and features atom economy and mild reaction conditions. An alternate method for the synthesis of diazo compounds was provided.