Efficient and practical synthesis of optically active 5-t-butyldimethylsiloxy-2-cyclohexenone as a convenient chiral 2,5-cyclohexadienone synthon
作者:Shinichi Hikichi、Georges P-J. Hareau、Fumie Sato
DOI:10.1016/s0040-4039(97)10206-4
日期:1997.12
An efficient and practical method for the preparation of optically active 5-t-butyldimethylsiloxy-2-cyclohexenone (3), a convenient chiral 2,5-cyclohexadienone synthon, from readily available ethyl 4-chloro-3-hydroxy-butyrate (7) has been developed where Ti(II)-mediated intramolecular nucleophilic acyl substitution and FeCl3-mediated ring expansion are the key reactions. The synthesis of racemic 6
一种有效而实用的方法,用于从容易获得的4-氯-3-羟基丁酸乙酯(7)制备旋光性5-叔丁基二甲基甲硅烷氧基-2-环己烯酮(3),一种方便的手性2,5-环己二酮合子。已经开发出其中Ti(II)介导的分子内亲核酰基取代和FeCl 3介导的环扩展是关键反应的地方。还描述了外消旋的6-叔丁基二甲基甲硅烷氧基-2-环庚烯酮(10)的合成,这是一种潜在的2,6-环庚二烯酮合成子。