An intramolecular [4+3]-cycloaddition approach to rameswaralide inspired by biosynthesis speculation
作者： Gerald Pattenden , Johan M. Winne
DOI: 10.1016/J.TETLET.2009.10.046
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摘要: Abstract A concise synthesis of the polycycle 27 , which incorporates 5,5,7-tricyclic ring core rameswaralide 1 using a biogenetically inspired acid-catalysed [4+3]-cycloaddition approach starting from furanobutenolide 26 is described, namely, 26→28 / 29→27 . Under thermal conditions, same gives alternative polycyclic compound 35 resulting [4+2]-cycloaddition involving furan as dienophile.
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