reactions have achieved great success for accessing carbon–carbon and carbon–heteroatom bonds during the past decade, metal-free acceptorless dehydrogenative cross coupling is still scarce and highly desirable. Herein we report a robust metal-free acceptorless dehydrogenative cross-coupling for both carbon–heteroatom and carbon–carbonbondformation. By synergistic catalysis of the organophotocatalyst
Synthesis of the cis-fused hexahydroxanthene system via cationic cascade cyclization
作者:Jeffrey D. Neighbors、Joseph J. Topczewski、Dale C. Swenson、David F. Wiemer
DOI:10.1016/j.tetlet.2009.04.052
日期:2009.7
The cis-fused hexahydroxanthene system can be obtained through a cascadecyclization initiated by Lewis acid-mediated epoxide opening and terminated by reaction with a MOM-protected phenol. Only a single diastereomer of the product was obtained with stereochemistry verified by diffraction analysis. This demonstrates the viability of this approach to natural products containing the cis-fused hexahydroxanthene