名称:
Ambient temperature method for the generation and Diels–Alder trapping of benzofuran-2,3-quinodimethane (2,3-dimethylidene-2,3-dihydrobenzofuran)
摘要:
The Ito-Saegusa method has been used to generate benzofuran-2,3-quinodimethane 10 from the corresponding silyl acetate 17b in solution at -4 degrees C. The intermediate reacts efficiently with a range of reactive Diels-Alder dienophiles with moderate to good levels of regioselection; the structure of the major diastereoisomer has been determined by X-ray analysis.