An efficient formal synthesis of balanol via the asymmetric epoxide ring opening reaction
作者:Michael H. Wu、Eric N. Jacobsen
DOI:10.1016/s0040-4039(97)00192-5
日期:1997.3
An efficient formal synthesis of balanol is described. The thirteen-step sequence features a highly enantioselective (92% ee) ring opening of 1,4-cyclohexadiene monoepoxide with TMSN3 catalyzed by the Cr-salen complex 3. A selective Beckmann rearrangement followed by amide reduction and nitrogen functionalization affords 2, thus completing a formal synthesis of balanol in 31% overall yield.
描述了一种有效的形式的巴拉诺醇合成。十三步序列的特征是具有1,4-环己二烯单环氧化物的高对映选择性(92%ee)的开环,其中TMSN 3由Cr-salen络合物3催化。选择性贝克曼重排,然后进行酰胺还原和氮官能化,得到2,从而以31%的总收率完成了Balanol的正式合成。