A new access to β-methyl substituted secondary alcohols. Application to the synthesis of 4-methylheptan-3-ol
作者:Josef Růžička、Bohumı́r Koutek、Ludvı́k Streinz、David Šaman、Ladislav Lešetický
DOI:10.1016/s0957-4166(99)00372-9
日期:1999.9
starting from 4-thianones. Key steps in the synthesis include: (a) reduction of 3-propyl-4-thianone to yield an easily separable isomeric mixture of cis- and trans-3-propyl-4-thianols; and (b) a highly efficient resolution of the particular cis/trans-isomers through a chromatographic separation of their respective esters with (S)-chlorofluoroacetic acid. Subsequent hydrolysis and desulfurization gave
通过从4-噻吩酮开始的五步路线合成了4-甲基庚烷-3-醇的所有四个立体异构体。合成的关键步骤包括:(a)还原3-丙基-4-噻吩酮,以生成易于分离的顺式和反式-3-丙基-4-噻吩醇异构体混合物;(b)通过用(S)-氯氟乙酸色谱分离其各自的酯,对特定的顺式/反式异构体进行高效拆分。随后的水解和脱硫以18%的总收率得到了所需的化合物。获得的所有立体异构体的纯度均优于90%。