synthesis of (Z)- or (E)-double bonds in 10-membered thiolcarbonates (3) was successfully conducted by controlling the chairlike-boatlike transition states in the [3,3]sigmatropic rearrangement of 8-membered thionocarbonates (2). The geometry of the product appeared to be highly dependent on the substituent pattern in the allylic system of the substrates (1). The 10-membered thiolcarbonates (3) were readily
通过在8元
硫代
碳酸酯的[3,3]σ重排中控制椅子状的船状过渡态,成功地进行了10元
硫代
碳酸酯(3)中(Z)或(E)-双键的高立体选择性合成(2)。产品的几何形状似乎高度依赖于基材(1)的烯丙基体系中的取代基图案。10元
硫代
碳酸酯(3)易于转化为(Z)-或(E)-烯丙基
硫代
碳酸酯(11)。(Z)-3j或3i的治疗用
锂在液
氨中得到高收率的(Z)-三取代或四取代的烯烃(12j和12i)。