Stereoselective Access to Fluorinated and Non-fluorinated Quaternary Piperidines: Synthesis of Pipecolic Acid and Iminosugar Derivatives
作者:Santos Fustero、Laia Albert、Natalia Mateu、Gema Chiva、Javier Miró、Javier González、José Luis Aceña
DOI:10.1002/chem.201102351
日期:2012.3.19
quaternary piperidines, both fluorinated and non‐fluorinated, has been achieved from a chiral imino lactone derived from (R)‐phenylglycinol. In the case of the fluorinated derivatives, the addition of (trifluoromethyl)trimethylsilane (TMSCF3) followed by iodoamination and migration of the CF3 group allowed access to four derivatives of α‐(trifluoromethyl)pipecolic acid. A theoretical study of the CF3‐group
通过衍生自(R)-苯基甘氨醇的手性亚氨基内酯可以制备出氟化的和非氟化的光学纯的季哌啶。在含氟衍生物的情况下,加入(三氟甲基)三甲基硅烷(TMSCF 3),然后进行碘化和CF 3基团的迁移,可以得到α-(三氟甲基)哌酸的四个衍生物。CF 3的理论研究进行了基团重排,以帮助建立这种罕见转化的反应机理。此外,还通过合适的合成中间体的非对映选择性二羟基化开发了一条通往三氟甲基取代的亚氨基糖的途径。相反,起始底物的烷基化以及随后的交叉复分解和氮杂-Michael反应导致目标化合物的α-烷基衍生物。