Total Synthesis of (±)-Kainic Acid with an Aza-[2,3]-Wittig Sigmatropic Rearrangement as the Key Stereochemical Determining Step
作者:James C. Anderson、Matthew Whiting
DOI:10.1021/jo030101q
日期:2003.8.1
route to the kainoid skeleton is exemplified by the synthesis of (+/-)-kainic acid from 3-butyn-1-ol. The route relies on the aza-[2,3]-Wittig sigmatropic rearrangement to efficiently install the relative stereochemistry between C2-C3. The C4 stereocenter was derived from a diastereocontrolled iodolactonization. The aza-[2,3]-Wittig rearrangement potentially allows structural diversity at C3 and the
由3-丁炔-1-醇合成(+/-)-海藻酸举例说明了通往类胡萝卜素骨架的灵活途径。该路线依赖于aza- [2,3] -Wittigσ重排,以有效地在C2-C3之间安装相对立体化学。C4立体中心源自非对映控制的碘内酯化。氮杂-[2,3]-维蒂希重排潜在地允许C3处的结构多样性,并且保持立体化学的甲苯磺酰基基团的置换允许C4处的结构多样性。发现在用高阶氰基铜酸盐试剂处理后,反式-C2羧酸官能团对于保持立体化学在C4上是最重要的。