Additions and corrections

New synthesis of pyridoacridines based on an intramolecular aza-Diels-Alder reaction followed by an unprecedented rearrangement

Juan M. Cuerva, Diego J. Cárdenas and Antonio M. Echavarren

Chem. Commun., 1999, 1721.

Unfortunately there were a number of errors in Schemes 1-3 in this communication. They are therefore reproduced below.

Scheme 1

Scheme 2 Reagents and conditions: i, NaH, TFAA, THF, 23 °C; TFA, CH₂Cl₂; ii, 10% aq HCl - 1,4-dioxane, reflux; iii, MnO₂, CH₂Cl₂, 23 °C; iv, NH₄Cl, NaOAc, EtOH, reflux; v, xylene, reflux.

Scheme 3

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