Synthesis of Three-, Five-, and Six-Membered Heterocycles Derived from New β-Amino-α-(trifluoromethyl) Alcohols
作者:Emilia Obijalska、Grzegorz Mlostoń、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.201000232
日期:——
Nucleophilic trifluoromethylation of α‐imino ketones 2, derived from arylglyoxal, with Ruppert–Prakash reagent (CF3SiMe3) offers a convenient access to the corresponding O‐silylated β‐imino‐α‐(trifluoromethyl) alcohols. In a ‘one‐pot’ procedure, by treatment with NaBH4, these products smoothly undergo reduction and desilylation yielding the expected β‐amino‐α‐(trifluoromethyl) alcohols 4. The latter
用Ruppert – Prakash试剂(CF 3 SiMe 3)衍生自芳基乙二醛的α-亚氨基酮2的亲核三氟甲基化作用,可方便地获得相应的O-甲硅烷基化的β-亚氨基α-(三氟甲基)醇。在“一锅法”程序中,通过用NaBH 4处理,这些产品平稳地进行还原和去甲硅烷基化反应,生成预期的β-氨基-α-(三氟甲基)醇4。后者作为起始材料多样三氟甲基化杂环的合成,包括氮丙啶5,1,3-恶唑烷8,-1,3-恶唑烷-2-酮9,1,3,2-恶唑磷烷-2-氧化物10,1 ,2,3-氧代噻唑烷2-氧化物11和吗啉-2,3-二酮12。还获得了9g旋光的5-(三氟甲基)-取代的1,3-恶唑烷二-2-酮。