Investigation of a Convergent Route to Purpuromycin: Benzofuran Formation vs Spiroketalization
摘要:
A mild and efficient [3+2] nitrile oxide/olefin cycloaddition allows coupling of the highly functionalized naphthalene and isocoumarin hemispheres of purpuromycin. A rationale of the inability of advanced keto alcohols to spirocyclize is presented based upon a systematic examination of the electronic factors present in these systems and suggests that the biosynthesis of purpuromycin does not proceed through open-chain intermediates.
Investigation of a Convergent Route to Purpuromycin: Benzofuran Formation vs Spiroketalization
摘要:
A mild and efficient [3+2] nitrile oxide/olefin cycloaddition allows coupling of the highly functionalized naphthalene and isocoumarin hemispheres of purpuromycin. A rationale of the inability of advanced keto alcohols to spirocyclize is presented based upon a systematic examination of the electronic factors present in these systems and suggests that the biosynthesis of purpuromycin does not proceed through open-chain intermediates.
A four-step route to synthetic equivalents of ortho-xylylenes: Dötz benzannulation, desilylation, bromo-dehydroxylation, and sultine formation. A concise approach to oxygenated linearly fused polycyclic aromatics
作者:Sambasivarao Kotha、Vikas R. Aswar、Amarender Manchoju
DOI:10.1016/j.tet.2016.03.047
日期:2016.5
A new route has been reported for the synthesis of densely oxygenated polycyclic aromatic compounds via cycloaddition approach. This strategy involves the Dötzbenzannulation and Diels-Alder reaction as key steps. Naphthalene synthons required here were generated by Dötzbenzannulation between aryl chromium carbene complexes and symmetrical internal alkyne.