Stereocontrolled Synthesis of Spiroketals via Ti(O<i>i-</i>Pr)<sub>4</sub>-Mediated Kinetic Spirocyclization of Glycal Epoxides with Retention of Configuration
作者:Sirkka B. Moilanen、Justin S. Potuzak、Derek S. Tan
DOI:10.1021/ja057908f
日期:2006.2.1
stereocontrolled target- and diversity-oriented synthesis of spiroketals. In contrast to most existing methods for spiroketal synthesis, this reaction does not rely upon thermodynamic control over the stereochemical configuration at the anomeric carbon. Stereochemically diverse glycals are first alkylated at the C1-position to introduce a hydroxyl-bearing sidechain, then epoxidized stereoselectively. Treatment with
Stereocontrolled Synthesis of Spiroketals via a Remarkable Methanol-Induced Kinetic Spirocyclization Reaction
作者:Justin S. Potuzak、Sirkka B. Moilanen、Derek S. Tan
DOI:10.1021/ja055033z
日期:2005.10.1
A methanol-induced kinetic spiroketalization reaction has been developed for the stereocontrolled target- and diversity-oriented synthesis of spiroketals. In contrast to existing methods for spiroketal synthesis, this reaction does not depend on thermodynamic product stability or require axial attack of an oxygen nucleophile. Stereodiverse glycals are alkylated at the C1 position with side chains bearing