endo-Selective Intramolecular Pauson-Khand Reactions ofγ-Oxygenated-α,β-unsaturated Phenylsulfones
作者:Javier Adrio、Marta Rodríguez Rivero、Juan C. Carretero
DOI:10.1002/1521-3765(20010601)7:11<2435::aid-chem24350>3.0.co;2-o
日期:2001.6.1
evaluation of the chemical and stereochemical scope of the process in comparison with the Pauson-Khand cyclization of non-sulfonylated enynes, its application to the stereoselective preparation of optically pure C6-substituted bicyclo[3.3.0]oct-1-en-3-ones, and the interpretation of the stereochemical outcome are also discussed.
通过哌啶促进的相应炔醛与苯磺酰基-(对甲苯基亚磺酰基)甲烷的缩合反应,可以很容易地制备出多种包含 γ-氧化-α,β-不饱和苯砜部分的 1,6-烯炔和 1,7-烯炔并进一步保护羟基。尽管关于缺电子烯烃在 Pauson-Khand 反应中不适用的说法经久不衰,但我们报告说,在热和胺 N-氧化物促进的条件下,这些 1-磺酰化烯炔在分子内 Pauson-Khand 反应中是极好的底物。此外,与通常的烯丙基取代烯炔的外选择性 Pauson-Khand 环化相比,这些 1-磺酰化 3-氧化烯炔的反应以中等或高内向选择性发生。