A concise approach to the core structures of pinnaic acid and halichlorine
作者:Sung-Hyun Yang、G. R. Clark、Vittorio Caprio
DOI:10.1039/b903904j
日期:——
An efficient and flexible synthetic approach to the core structures of pinnaicacid and halichlorine is described using spirocyclic nitrone 4 as a key intermediate. 1,3-Dipolar cycloaddition of 4 with dipolarophile 8 provides access to the azaspirocyclic core of pinnaicacid 5 while the spiroquinolizidine core of halichlorine 6 has been synthesised viacycloaddition of 4 with dipolarophile 29. Nitrone