A Facile Approach to the Synthesis of Allylic Spiro Ethers and Lactones
作者:Ming-Chang Yeh、Yi-Chin Lee、Tsao-Ching Young
DOI:10.1055/s-2006-950294
日期:2006.11
Treatment of 3-[(alkoxycarbonyl)alkyl]-substituted conjugated cycloalkenones with diisobutylaluminum hydride at -78 °C followed by acid quenching furnishes spiro ethers, whereas the corresponding 3-(carboxyalkyl)-substituted cycloalkenones generate spiro lactones upon reaction with sodium borohydride at 30 °C followed by acid quenching.
3-[(alkoxycarbonyl)alkyl]-substituted conjugated cycloalkenones with diisobutylaluminum hydride at -78 °C and followed by acid quenching furnishes spiro ethers, 而相应的 3-(carboxyalkyl)-substituted cycloalkenones generated spiro lactones upon reaction with sodium borohydride at 30 °C and followed by acid quenching.
Lin, Chu-Chung; Hsia, Ket-Shang; Wu, Hsien-Jen, Journal of the Chinese Chemical Society, 1993, vol. 40, # 6, p. 587 - 592
作者:Lin, Chu-Chung、Hsia, Ket-Shang、Wu, Hsien-Jen
DOI:——
日期:——
Amberlyst-15-catalyzed intramolecular SN2′ oxaspirocyclization of secondary allylic alcohols. Application to the total synthesis of spirocyclic ethers theaspirane and theaspirone
1-oxaspiro[5.5]undec-7-ene systems have been prepared by utilizing Amberlyst-15-catalyzed intramolecular SN2′ oxaspirocyclizations of secondary allylicalcohols under mild reaction conditions in quantitative yields. This oxaspirocyclization was applied to the total synthesis of theaspirane and theaspirone from β-ionone in five steps.
各种取代的1-氧杂螺[4.4]非6-烯,1-氧杂螺[4.5] dec-6-烯,6-氧杂螺[4.5] dec-1-烯和1-氧杂螺[5.5] undec-7-通过在温和的反应条件下以定量收率利用仲烯丙基醇的Amberlyst-15催化的分子内S N 2'氧代螺环化反应制备烯键体系。该氧杂螺环化以五个步骤应用于从β-紫罗兰酮的茶皮螺烷和茶皮螺酮的全合成中。