Concise syntheses of 3-methylenetetrahydrofuran-2-one derivatives and related systems
作者:Robert M. Adlington、Anthony G. M. Barrett
DOI:10.1039/p19810002848
日期:——
Using the Shapiro reaction, the title compounds were prepared in ‘one pot’ from the condensation of two ketones, or an aldehyde and a ketone, with carbon dioxide. For example, acetone 2,4,6-tri-isopropylbenzenesulphonylhydrazone was treated in sequence with n-butyl-lithium (–50 °C), acetone (–50 °C), n-butyl-lithium (–78 to 0 to –78 °C), carbon dioxide (–78 °C), and trifluoroacetic acid (25 °C) to