A large-scale synthesis of meso-2,3-difluoro-1,4-butanediol in 5 steps from (Z)-but-2-enediol is described. Crystallographic analysis of the diol and the corresponding benzyl ether reveals an anti conformation of the vicinal difluoride moiety. Monosilylation of the diol is high-yielding but all attempts to achieve chain extension through addition of alkyl Grignard and acetylide nucleophiles failed.
本文描述了从(Z)-丁-2-烯二醇经过5步合成大规模的meso-2,3-二氟-1,4-丁二醇的方法。二醇及其相应的苄基醚的晶体学分析表明,邻二氟基团呈现反式构象。二醇的单硅化反应收率高,但所有试图通过烷基格氏试剂和乙炔核苷的加成来实现链延伸的尝试均失败。