Studies on the synthetic utility of [6+3] cycloaddition of pentafulvenes with 3-oxidopyrylium betaines: efficient synthesis of fused ring cyclooctanoids
摘要:
A study on the synthetic utility of [6+3] cycloaddition of pentafulvenes with 3-oxidopyrylium betaines is described. 5-8 Fused oxa-bridged cyclooctanoids, the products of the above methodology undergo facile Diels-Alder reaction, dipolar cycloaddition, Luche reduction and selective hydrogenation over Pd/C leading to functionalized molecules, which can be transformed to oxa-bridged fused cyclooctanoids. We have shown that the carbon framework of the molecules can be directly expanded from the product, thus enhancing the synthetic versatility of the products. (c) 2006 Elsevier Ltd. All rights reserved.