mercaptan to (+)-pulegone followed by Na/NH3 reduction and condensation of the resulting hydroxythiol with paraformaldehyde. The utility of this chiral adjuvant is exemplified by the asymmetric synthesis of the title compound in 93% e.e.
通过将苄基
硫醇1,4-加成至(+)-普勒高酮,然后用Na / NH 3还原并使所得的羟基
硫醇与多
聚甲醛缩合,可以制备手性,构象锁定的1,3-
氧杂蒽。该手性佐剂的效用以93%ee中标题化合物的不对称合成为例