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。
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.
Freshening compositions and devices comprising same
申请人:The Procter & Gamble Company
公开号:US10113140B2
公开(公告)日:2018-10-30
The present invention relates to freshening compositions and devices comprising same that comprise a composition comprising malodor reduction compositions and methods of making and using such compositions. Such malodor control technologies do not unduely interfere with the scent of the perfumed or unperfumed situs that is treated with the malodor control technology.
A composition including a plurality of particles, wherein the particles include: about 30% to about 95% by weight of a carrier; about 0.1% to about 30% by weight of a perfume; and about 0.00025% to about 30% by weight of a malodor agent; wherein the malodor agent comprises one or more malodor reduction materials having a Blocker Index of less than 3 or a Blocker Index average of 3 to about 0.001; and wherein each of the particles has a mass between about 0.1 mg to about 5 g.
The present invention relates to a fibrous structure including one or more encapsulated malodor reduction compositions and methods of making and using such a fibrous structure.