An Effective Method for the Synthesis of<sup>13</sup>C-Labeled Polyprenylhydroxybenzoic Acids
作者:Wolfgang Steglich、Martin Lang
DOI:10.1055/s-2005-861863
日期:——
The synthesis of side-chain 13C-labeled geranylgeranyl-4-hydroxybenzoic acids and geranylgeranyl-3,4-dihydroxybenzoic acids is described. The synthesis starts from O-protected methyl hydroxyiodobenzoates, which are transformed into Grignard reagents by low-temperature iodine-magnesium exchange according to Knochel’s procedure. Copper catalyzed cross-coupling with labeled geranylgeranyl bromide followed by deprotection affords the products with good yields and full retention of stereochemistry.
描述了侧链13C标记的香叶醇-4-羟基苯甲酸和香叶醇-3,4-二羟基苯甲酸的合成。合成从O保护的甲基羟基碘苯酸酯开始,通过低温碘镁交换按照Knochel的方法转化为Grignard试剂。随后与标记的香叶醇溴化物进行铜催化的交叉偶联反应,去保护后,产物的产率良好且立体化学完全保留。