Abstract
Heterocycles, 55, 855-859 (2001). Synthesis of Trisubstituted 4-Oxepanones by the Lewis Acid-Promoted Three-Component Ring-Expansion Reaction of Cyclopropapyranones, Silyl Enolates and Glyoxylates Yoshiaki Sugita(杉田義昭)*, Chikasa Kimura(木村爾沙), and Ichiro Yokoe (横江一朗) Faculty of Pharmaceutical Sciences, Josai University, Sakado, Saitama 350-0295 In the presence of SnCl4, cyclopropapyranones easily reacted with the silyl enolates and ethyl glyoxylate to give the trisubstituted 4-oxepanones in good yields with moderate stereoselectivity. In all the reactions, the trans-E-isomer was mainly obtained.
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