Substituted γ and δ-ketoaldehydes may be conveniently synthesized in two steps from imine carbanions, which are obtained by reaction with hyperbasic media. These anions are stable at low temperature (−30°); they react with functional electrophiles to afford masked ketoaldehydes which may be cyclised into various cyclopentenones or cyclohexenones.
取代的γ和δ-酮醛可以方便地从
亚胺碳负离子分两步合成,
亚胺碳负离子是通过与高碱性介质反应而获得的。这些阴离子在低温(−30°)下稳定;它们与功能性亲电试剂反应,得到被掩蔽的酮醛,可以将其环化成各种
环戊烯酮或
环己烯酮。