Formal (4+1) Cycloaddition and Enantioselective Michael-Henry Cascade Reactions To Synthesize Spiro[4,5]decanes and Spirooxindole Polycycles
作者:Ji-Rong Huang、Muhammad Sohail、Tohru Taniguchi、Kenji Monde、Fujie Tanaka
DOI:10.1002/anie.201701049
日期:2017.5.15
the spiro[4,5]decane system. Spiro[4,5]decanes bearing oxindoles containing three stereogenic centers and spirooxindole polycycles having seven stereogenic centers, including two all‐carbon chiral quaternary centers and one tetrasubstituted chiral carbon center, were obtained with high diastereo‐ and enantioselectivities.
螺环[4,5]癸烷和带有螺环[4,5]癸烷系统的多环化合物是重要的生物功能分子。描述了非对映选择性的正式(4 + 1)环加成反应,以提供氧吲哚官能化的螺[4,5]癸烷和(4 + 1)环加成产物的有机催化对映选择性迈克尔-亨利级联反应,生成带有螺[4]的螺并吲哚多环衍生物。 ,5]癸烷系统。获得具有3个立体异构中心的带有螺吲哚的螺[4,5]癸烷和具有7个立体异构中心的螺并吲哚多环,包括两个全碳手性季铵中心和一个四取代手性碳中心,它们具有非对映异构和对映异构体高的选择性。