Synthesis of (S)- and (R)-3-[(benzyloxycarbonyl)oxy]-2,2-difluorotetradecanoic acid
作者:Masao Shiozaki、Yoshiyuki Kobayashi
DOI:10.1016/s0957-4166(00)80289-x
日期:1992.1
Optically active 3-[(benzyloxycarbonyl)oxy]-2,2-difluorotetradecanoic acids, (S)-11 and (R)-22 were synthesized from 3,4,6-tri-O-acetyl-D-glucal and methyl galactopyranoside via 4 and 15, respectively. Reaction of 4 and 15 with octylidene triphenylphosphorane followed by Jones oxidation of the alcohols, treatment with DAST, catalytic hydrogenation of double bond and deprotection of benzyl groups yielded
由3,4,6-三-O-乙酰基-D-葡糖醛酸和甲基吡喃半乳糖苷合成旋光的3-[(苄氧基羰基)氧基] -2,2-二氟十四烷酸(S)-11和(R)-22分别通过4和15。4和15与辛基三苯基磷烷反应,然后进行醇的琼斯氧化,用DAST处理,双键催化加氢和苄基脱保护基,得到2,2-二氟-1,3-二羟基十四烷(S)-7和(R)-18,从中(S)-通过四个步骤分别获得11和(R)-22。