The nucleophilic Sn2' bridge opening of 7-oxabicyclo[2.2.1] hept-5-en-2-ols with organolithium reagents occurs in a regio- and stereospecific fashion to produce 6-substituted-cyclohex-4-en-1,3-diols, regardless of the stereochemistry at C-2. A free alcohol functionality is necessary to attain complete regiocontrol of the process. The methodology is utilized to prepare an optically pure cyclohexene
7-
氧杂
双环[2.2.1]庚-5-烯-2-醇与
有机锂试剂的亲核Sn2'桥开口以区域和立体特异性方式发生,以产生6-取代的
环己-4-
烯-1,3
-二醇,无论在C-2处的立体
化学如何。要完全控制该过程,必须使用游离的醇功能。该方法用于制备光学纯的
环己烯衍
生物(+)-(1S,3S,6R)-6-正丁基-3-
甲基-
环己-4-en-1,3
-二醇(5b),模型系统。