Abstract
Silica gel (60-120 mesh) efficiently catalyses the opening of epoxide rings by amines at rt under solvent-free conditions providing an easy method for the synthesis of 2-amino alcohols. Aromatic and aliphatic amines react with cyclohexene oxide with exclusive formation of the trans-2-aryl/alkylaminocyclohexanols in high yields. A complementary regioselectivity is exhibited by aromatic and aliphatic amines during the reaction with styrene oxide. The epoxide ring of non-styrenoidal unsymmetrical alkene oxide undergoes selective nucleophilic attack at the sterically less hindered carbon by aniline.
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