Various 3,3-dialkoxy-2,3-dihydro-1-hydroxy-1H-isoindoles (2) were obtained by treating 2-cyanobenzaldehyde (1) with alcohols in the presence of an acid catalyst such as silica gel. In the reaction using a base catalyst such as triethylamine and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), 3-alkoxy-2,3-dihydro-1H-isoindol-1-ones (4) were formed via 3-alkoxy-1,3-dihydro-1-isobenzofuranimine (3). The use of 1,4-diazabicyclo[2.2.2]octane (DABCO) and N,N,N′,N′-tetramethylethylenediamine (TMEDA) gave 2 besides 3 and 4. A convenient and selective synthesis of isoindoles and its derivatives are described.
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