通过多米诺酰基酰基化电环化可 轻松获得5-carboalkoxy-2,3-dihydro-4 H -pyran -4-ones :天然产物dihydronaphthopyran-4-one一类的前三步全合成†
摘要:
在CaCl 2的存在下,β-酮酸酯与α,β-不饱和酰氯之间的分子间多米诺C-酰化/6π-氧杂电环化反应很容易发生,从而提供了多种多取代的5-carboalkoxy-2,3-dihydro-4 H -pyran -4-ones,良率高。该产品已成功地用作前体,用于萘稠合的吡喃-4-酮环系统的简单有效构建。这种分子内Friedel-Crafts酰基化芳构化方法可用于合成抑制植物生长的二氢萘吡喃酮类天然产物。
Simple access to 5-carboalkoxy-2,3-dihydro-4H-pyran-4-ones via domino acylative electrocyclization: the first three step total synthesis of the dihydronaphthopyran-4-one class of natural products
作者:Andivelu Ilangovan、Palaniappan Sakthivel
DOI:10.1039/c4ra11174e
日期:——
Intermolecular domino C-acylation/6π-oxaelectrocyclization between β-ketoesters and α,β-unsaturated acid chlorides took place readily in the presence of CaCl2 to afford a variety of polysubstituted 5-carboalkoxy-2,3-dihydro-4H-pyran-4-ones, in good yields. The products were successfully exploited as precursors, for a simple and efficient construction of a naphthalene fused pyran-4-one ring system.
在CaCl 2的存在下,β-酮酸酯与α,β-不饱和酰氯之间的分子间多米诺C-酰化/6π-氧杂电环化反应很容易发生,从而提供了多种多取代的5-carboalkoxy-2,3-dihydro-4 H -pyran -4-ones,良率高。该产品已成功地用作前体,用于萘稠合的吡喃-4-酮环系统的简单有效构建。这种分子内Friedel-Crafts酰基化芳构化方法可用于合成抑制植物生长的二氢萘吡喃酮类天然产物。