Enantio- and Diastereoselective Synthesis of<i>exo</i>-Peroxyacetals: An Organocatalyzed Peroxyhemiacetalization/oxa-Michael Addition Cascade
作者:Sanjay Maity、Biswajit Parhi、Prasanta Ghorai
DOI:10.1002/anie.201511165
日期:2016.6.27
been developed using cinchona‐alkaloid‐based chiral bifunctional organocatalysts to provide cis‐configured exo‐peroxyacetals, a new class of organic peroxide, in good yields with excellent enantio‐ and diastereoselectivities. The resulting cis‐configured exo‐peroxyacetals were converted into the corresponding trans‐configured peroxyacetals without affecting the enantioselectivity. Furthermore, the displacement
前所未有的对映选择性peroxyhemiacetalization /氧杂Michael加成的级联邻-甲酰基homochalcones一直采用金鸡纳生物碱基于双功能手性有机催化剂提供开发顺-型外-peroxyacetals,一类新的有机过氧化物,在良好的收益率具有优良的映和非对映选择性。将得到的顺式-型外-peroxyacetals被转化成相应的反式-型过氧缩醛,而不会影响对映选择性。此外,exo的过氧化物部分的置换已证明具有各种亲核试剂的过氧缩醛可提供具有高非对映选择性和极好的对映选择性的1,3-二取代的异色满。