An Efficient Enantioselective Synthesis of Florfenicol Based on Sharpless Asymmetric Dihydroxylation
作者:Fen-Er Chen、Qiu-Qin He、Zhong-Hua Wang、Chen Zheng、Feng Li、Lei Zhao
DOI:10.1055/s-0031-1289706
日期:2012.3
highly enantioselective synthesis of florfenicol via a new intermediate threo-dihydroxy ester, with a Sharpless asymmetric dihydroxylation as the key step, is reported. A ring-opening/reduction strategy avoids the formation of a chlorinated byproduct that occurs in Schumacher’s phenyloxazoline procedure. The overall yield of florfenicol by this new process is 23% based on 4-(methylsulfonyl)benzaldehyde
据报道,通过新的中间体苏-二羟基酯,以Sharpless不对称二羟基化为关键步骤,可以高效,高对映选择性地合成氟苯尼考。开环/还原策略可避免在舒马赫的苯恶唑啉工艺中形成氯化副产物。基于4-(甲基磺酰基)苯甲醛,通过该新方法的氟苯尼考的总产率为23%。 卤化-杂环-不对称合成-砜-药物