Ring-expansion reaction of 1-hydroperoxy-16-oxabicyclo[10.4.0]hexadecane catalyzed by copper ions: use in the synthesis of 15-pentadecanolide
摘要:
A catalytic procedure has been developed for the synthesis of 15-pentadecanolide (1) from readily available 1-hydroperoxy-16-oxabicyclo[10.4.0]hexadecane (2). The method is based on the reaction of hydroperoxide 2 with copper acetate (0.15-5 mol.%). Ring expansion occurred as a result of generation of tertiary bicyclohexadecyloxyl radicals 4 from hydroperoxide 2 under the action of Cu-I ions, beta-scission of the radicals accompanied by regioselective cleavage of the bridge bond to form macrocyclic C-centered radicals 5, and their oxidation by Cu-II ions to (E)-11- and (E)-12-pentadecen-15-olides (6). The products obtained were converted into 15-pentadecanolide by subsequent catalytic hydrogenation over a Pd catalyst in a yield of more than 90% with respect to hydroperoxide 2.
Ring-expansion reaction of 1-hydroperoxy-16-oxabicyclo[10.4.0]hexadecane catalyzed by copper ions: use in the synthesis of 15-pentadecanolide
摘要:
A catalytic procedure has been developed for the synthesis of 15-pentadecanolide (1) from readily available 1-hydroperoxy-16-oxabicyclo[10.4.0]hexadecane (2). The method is based on the reaction of hydroperoxide 2 with copper acetate (0.15-5 mol.%). Ring expansion occurred as a result of generation of tertiary bicyclohexadecyloxyl radicals 4 from hydroperoxide 2 under the action of Cu-I ions, beta-scission of the radicals accompanied by regioselective cleavage of the bridge bond to form macrocyclic C-centered radicals 5, and their oxidation by Cu-II ions to (E)-11- and (E)-12-pentadecen-15-olides (6). The products obtained were converted into 15-pentadecanolide by subsequent catalytic hydrogenation over a Pd catalyst in a yield of more than 90% with respect to hydroperoxide 2.
A rearrangement of 1-hydroperoxy-2-oxabicycloalkanes into lactones of ω-acyloxy-(ω-3)-hydroxyalkanoic acids related to the Criegee reaction
作者:Yuri N Ogibin、Alexandre O Terent'ev、Alexandre V Kutkin、Gennady I Nikishin
DOI:10.1016/s0040-4039(01)02368-1
日期:2002.2
1-Hydroperoxy-2-oxabicyclo[n.4.0]alkanes (n=3, 4, 5 and 10) on heating with formic or acetic acid containing a catalytic amount of sulfuric acid undergo a rearrangement into lactones of ω-acyloxy-(ω-3)-hydroxyalkanoic acids by a mechanism related to the Criegee reaction.
在与含有催化量硫酸的甲酸或乙酸加热下,将1-羟过氧-2-氧杂双环[ n .4.0]烷烃(n = 3、4、5和10)进行重排,使其成为ω-酰氧基-(ω -3)-羟基链烷酸是通过与Criegee反应有关的机理而形成的。
Process for the preparation of 1-hydroperoxy-16-oxabicyclo[10.4.0]hexadecane
申请人:Lambrecht Stefan
公开号:US20050085536A1
公开(公告)日:2005-04-21
Process for the preparation of 1-hydroperoxy-16-oxabicyclo[10.4.0]hexadecane (DDP-OOH), wherein 13-oxabicyclo[10.4.0]hexadec-1(12)-ene (DDP) and hydrogen peroxide are reacted in a diluent in the presence of a strong acid, the diluent has a pKa value of greater than or equal to 4.5 and the strong acid has a pKa value of less than or equal to 1.5, wherein after the reaction has taken place, the strong acid is neutralized with at least 0.9 molar equivalent of a base.
Eine neuartige Fragmentierung bicyclischer Enoläther Verfahren zur Darstellung macrocyclischer Lactone
作者:J. Becker、G. Ohloff
DOI:10.1002/hlca.19710540854
日期:1971.12.10
Vicinal α-hydroperoxy-tetrahydropyranyl ethers annelated to cyclododecane are smoothly converted by homolytic fission in about 75% yield to a mixture of the macrocyclic lactones 3, 4, and 5. Based on this observation, an economically feasible synthesis of Exaltolide1 (>65% yield) has been developed. The mechanism of this new β-fragmentation reaction is discussed.
An inexpensive iron-catalyzed alkoxyl radical-induced C–C bond cleavage/gem-difluoroalkylation cascade is presented. Regulated by the structure of alkoxyl radical precursors, fluorinated distal diketones were synthesized through a ring-opening strategy and difluoroalkylated medium-sized lactones and macrolactones were constructed via a ring-expansion strategy. Both protocols proceeded under mild and
Verfahren zur Herstellung von 11(12)-Pentadecen-15-oliden und von 1-Hydroperoxy-16-oxabicyclo[10.4.0]hexadecan
申请人:Symrise GmbH & Co. KG
公开号:EP1690860A1
公开(公告)日:2006-08-16
Die Erfindung betrifft ein
Verfahren zur Herstellung von 11(12)-Pentadecen-15-oliden ausgehend von 1-Hydroperoxy-16-oxabicyclo[10.4.0]hexadecan (DDP-OOH) in Gegenwart einer Cu-(II)-verbindung und eines Verdünnungsmittels, wobei während der Reaktion ein Azeotrop enthaltend Wasser und Verdünnungsmittel abdestilliert wird, und weiterhin ein
Verfahren zur Herstellung von DDP-OOH ausgehend von 13-Oxabicyclo[10.4.0]hexadec-1(12)-en (DDP) und Wasserstoffperoxid in Gegenwart von Essigsäure und Schwefelsäure, worin die Umsetzung in Gegenwart von 0,05 bis 5 mol%
H2SO4 bezogen auf DDP durchgeführt wird.