β-Nitroenamine having a formyl group behaves as the synthetic equivalent of unstable nitromalonaldehyde upon treatment with ketones under basic conditions and leads to 2,6-disubstituted 4-nitrophenols. The present method is safer than the conventional one using sodiumnitromalonaldehyde and enables the preparation of hitherto unknown nitrophenols.
Catalytic Asymmetric Diels-Alder Reaction of Quinone Imine Ketals: A Site-Divergent Approach
作者:Takuya Hashimoto、Hiroki Nakatsu、Keiji Maruoka
DOI:10.1002/anie.201410957
日期:2015.4.7
The catalytic asymmetric Diels–Alder reaction of quinoneimineketals with diene carbamates catalyzed by axially chiral dicarboxylic acids is reported herein. A variety of primary and secondary alkyl‐substituted quinone derivatives which have not been applied in previous asymmetric quinone Diels–Alder reactions could be employed using this method. More importantly, we succeeded in developing a strategy