Highly Regioselective Palladium‐Catalyzed Carboxylation of Allylic Alcohols with CO
<sub>2</sub>
作者:Tsuyoshi Mita、Yuki Higuchi、Yoshihiro Sato
DOI:10.1002/chem.201503359
日期:2015.11.9
stoichiometric transmetalation agent under a CO2 atmosphere (1 atm). This carboxylation proceeded in a highly regioselective manner to afford branched carboxylic acids predominantly. The β,γ‐unsaturated carboxylic acid thus obtained was successfully converted into an optically active γ‐butyrolactone, a known intermediate of (R)‐baclofen.
使用ZnEt 2作为化学计量的重金属化试剂,在CO 2气氛(1个大气压)下,在催化量的PdCl 2和PPh 3存在下,将各种烯丙醇羧化。该羧化以高度区域选择性的方式进行,主要得到支链羧酸。如此获得的β,γ-不饱和羧酸已成功转化为旋光性γ-丁内酯,这是(R)-baclofen的已知中间体。