Organocatalytic 1,4‐Addition Reaction of 2‐Formyl(thio)esters to Vinylketones: An Efficient Access to Acyclic Chiral Building Blocks with a Quaternary Carbon Stereocenter
作者:Toshifumi Tatsumi、Tomonori Misaki、Takashi Sugimura
DOI:10.1002/chem.201504479
日期:2015.12.21
2‐Formyl(thio)esters were utilized as pronucleophiles to obtain less‐accessible acyclic chiral building blocks bearing versatile functional groups on a quaternary carbon atom for enantioselective 1,4‐addition to vinylketones. To achieve high enantioselectivity in the present 1,4‐addition reaction, thiourea‐tertiary amines containing a bulky chiral backbone were developed as catalysts, and several derivatizations
2-甲酰基(硫代)酯被用作亲核试剂,以获得难以接近的无环手性结构单元,该单元在季碳原子上带有多功能官能团,可以将乙烯基对映体选择性地进行1,4加成。为了在当前的1,4加成反应中实现高对映选择性,开发了含有庞大手性骨架的硫脲叔胺作为催化剂,并对产物进行了几次衍生化反应以证明产物的合成用途。