Unsymmetrical functionalization of 1,3-cyclohexadienes: Palladium-catalyzed stereoselective 1,4-acyloxy-alkoxylation
摘要:
Palladium-catalyzed reaction of 1,3-cyclohexadiene with alcohols and acetic or benzoic acid under mild acidic conditions gives trans-1-acetoxy- or trans-1-benzyloxy-4-alkoxy-2-cyclohexenes, respectively, with high regio-and stereo-selectivity. The unsymmtrical 1,4-acyloxy-alkoxy products are obtained by fine tuning the reaction conditions in a narrow pH range. (C) 1998 Elsevier Science Ltd. All rights reserved.