The Lewis acid-catalysed reaction of 1-trimethylsiloxy-1,3-cyclohexadienes with aldehydes and trialkyl orthoformates afforded the corresponding 4-substituted 2-cyclohexenones. A new reaction of 2,4,6-trienones with m-chloroperbenzoic acid followed by the reduction with zinc in acetic acid gave 7-hydroxy-3,5-dienones. Utilizing these efficient reactions, megastigma-4,6,8-trien-3-ones, 3-hydroxy-β-ionol, 3-hydroxy-β-ionone, 5,6-epoxy-3-hydroxy-β-ionol, and 3-oxo-α-ionol were successfully synthesized.
路易斯酸催化的1-三甲基
硅氧基-
1,3-环己二烯与醛和三烷基
正戊酸酯的反应得到了相应的4-取代2-
环己烯酮。2,4,6-
三烯酮与对
氯酸
苯甲酸的反应,再经
过醋酸中
锌还原,得到7-羟基-3,5-二烯酮。利用这些高效反应,成功合成了megastigma-4,6,8-
三烯-3-酮、3-羟基-β-离子醇、3-羟基-β-离子酮、5,6-环氧-3-羟基-β-离子醇以及3-氧基-α-离子醇。