Periselectivity in the Cycloaddition Reactions of Pentafulvenes with 3-Oxidopyrylium Betaines: Effect of Substituent on the C-6 Carbon
作者:K. Radhakrishnan、K. Krishnan、Rani Rajan
DOI:10.1055/s-2008-1067093
日期:——
Periselectvity in cycloaddition reactions of pentafulvenes with 3-oxidopyrylium betaines is examined. The results of our studies show that depending on the substituent on the C-6 carbon, the reaction may proceed either through the [6+3] or the [3+2] pathway. The results of our investigations with various pentafulvenes are discussed.
Regioselective Synthesis of Novel 7-5-8-Fused Oxabridged Tricyclic Molecules via Consecutive Dipolar Cycloaddition of Pentafulvenes with 3-Oxidopyrylium Betaines
Pentafulvenes undergo consecutive dipolar cycloadditions with various substituted oxidopyrylium betaines resulting in the formation of a new class of structurally interesting 7-5-8-fused oxabridged tricyclic molecules.
Synthesis of benzofurans via an acid catalysed transacetalisation/Fries-type O → C rearrangement/Michael addition/ring-opening aromatisation cascade of β-pyrones
作者:Siddheshwar K. Bankar、Jopaul Mathew、S. S. V. Ramasastry
DOI:10.1039/c6cc01016d
日期:——
An unusual and facile approach for the synthesis of 2-benzofuranyl-3-hydroxyacetones from 6-acetoxy-[small beta]-pyrones and phenols is presented.