Asymmetric Synthesis of Functionalized Chromans via a One-Pot Organocatalytic Domino Michael-Hemiacetalization or -Lactonization and Dehydration Sequence
作者:Dieter Enders、Gregor Urbanietz、Robert Hahn、Gerhard Raabe
DOI:10.1055/s-0031-1289683
日期:2012.3
Starting from 2-(nitrovinyl)phenols and various cyclic dicarbonyl nucleophiles, a one-pot thiourea-catalyzed diastereo- and enantioselective synthesis of polyfunctionalized chroman derivatives via a domino Michael-hemiacetalization and dehydration sequence as well as via a domino Michael-lactonization reaction is reported. Cyclopenta[b]chromenes, tricyclic spirochromans, and tetrahydro-1H-xanthenes
从2-(硝基乙烯基)苯酚和各种环状二羰基亲核试剂开始,通过多米诺米歇尔半缩醛化和脱水序列以及多米诺米歇尔-内酰胺化反应,通过一锅硫脲催化的非对映和对映选择性合成多官能化苯并二氢吡喃衍生物。报告。环戊二烯并[ b ]色烯,三环spirochromans,和四氢ħ -xanthenes轴承的各种官能团的可以以这种方式以良好至优异的产率(56-91%)合成并具有非常好的diastereo-(88-99% de)和对映选择性(83-99%ee)。 有机催化-多米诺反应-硫脲-一锅法-色原