Synthesis of Spiro[5.4]decenones and Their Transformation into Bicyclo[4.4]deca-1,4-dien-3-ones by Domino ?Elimination- Double-Wagner-Meerwein-Rearrangement? Reactions
作者:Gopal Bose、Ehsan Ullah、Peter Langer
DOI:10.1002/chem.200400707
日期:2004.12.3
The [3+3] cyclization of 1,3-bis-silyl enol ethers with 1,1-diacylcyclopentanes allows a convenient synthesis of spiro[5.4]decenones. Treatment of these compounds with trifluoroacetic acid (TFA) afforded a great variety of bicyclo[4.4.0]deca-1,4-dien-3-ones containing an angular alkyl group. This core structure occurs in a number of pharmacologically relevant natural products.
1,3-二甲硅烷基烯醇醚与1,1-二酰基环戊烷的[3 + 3]环化反应可方便地合成螺[5.4]癸烯。用三氟乙酸(TFA)处理这些化合物可得到各种各样的带有角烷基的双环[4.4.0] deca-1,4-dien-3-one。这种核心结构出现在许多与药理有关的天然产物中。