[EN] 2,4,6,7-TETRAHYDRO-PYRAZOLO[4,3-D]PYRIMIDIN-5-ONE DERIVATIVES AND RELATED COMPOUNDS AS C5A RECEPTOR MODULATORS FOR TREATING VASCULITIS AND INFLAMMATORY DISEASES [FR] DÉRIVÉS DE 2,4,6,7-TÉTRAHYDRO-PYRAZOLO[4,3-D]PYRIMIDIN-5-ONE ET COMPOSÉS APPARENTÉS EN TANT QUE MODULATEURS DU RÉCEPTEUR C5A POUR LE TRAITEMENT DE LA VASCULARITE ET DE MALADIES INFLAMMATOIRES
Lewis Acid-Catalyzed Halonium Generation for Morpholine Synthesis and Claisen Rearrangement
作者:Jeewani P. Ariyarathna、Nur-E Alom、Leo P. Roberts、Navdeep Kaur、Fan Wu、Wei Li
DOI:10.1021/acs.joc.1c02804
日期:2022.3.4
We disclose here practical strategies toward the synthesis of morpholines and Claisenrearrangement products based on the divergent reactivity of a common halonium intermediate. These reactions employ widely available alkenes in a Lewis acid-catalyzed halo-etherification process that can then transform them into the desired products with exceptional regioselectivity for both activated and unactivated