Toward the Briarane Core via 1,3-Dipolar Cycloaddition.
Organic letters(2024)
摘要
The complete C20 framework of brianthein W was established, featuring hydroboration/allylation, to provide the C1-C2 quaternary/tertiary stereoarray with excellent stereocontrol. Intramolecular nitrile oxide cycloaddition (INOC) was adopted as the key transformation to establish the trans-fused 6/10-bicyclic ring system. Evolution of the second INOC event revealed the intricacies governing regioselectivity, which ultimately led to construction of the highly strained 10-membered carbocycle.
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