Free-radical cyclization of enantiomerically enriched 2-p-tolylthio derivatives of 2-allylcyclohexanones with Mn(III): asymmetric synthesis of bridged bicyclic ketones and thiochroman-3-ones
作者:J.L Garcı́a-Ruano、A Rumbero
DOI:10.1016/s0957-4166(99)00467-x
日期:1999.11
enriched 2-allyl-2-(p-tolylsulfonyl)-cyclohexanone 4 and 2-allyl-2-(p-tolylsulfenyl)cyclohexanone 9 are reported. The observed chemoselectivity (reaction on the allylic double bond yielding bridgedbicyclicketones vs. reaction on the aromatic ring of the p-tolyl group affording thiochroman-3-ones) depends on the sulfur function (sulfone or thioether, respectively), which determines the electronic density
Mn(III)-Based Oxidative Free-Radical Cyclizations of Unsaturated Ketones
作者:Bridget McCarthy Cole、Luning Han、Barry B. Snider
DOI:10.1021/jo961199u
日期:1996.1.1
free-radical cyclization of unsaturated ketones is a versatile synthetic procedure with broad applicability. For example, oxidation of cyclopentanone 1a with 2 equiv of Mn(OAc)(3).2H(2)O and 1 equiv of Cu(OAc)(2).H(2)O in AcOH at 80 degrees C for 1.5 h affords 75% of bicyclo[3.2.1]oct-3-en-8-one 8a and 15% of bicyclo[3.2.1]oct-2-en-8-one 9a. Bridgedbicyclicketones that cannot enolize further are isolated
Verfahren zur Herstellung von Cyclooctandicarbonsäurediestern
申请人:HÜLS AKTIENGESELLSCHAFT
公开号:EP0400292A2
公开(公告)日:1990-12-05
2.1 Cyclooctandicarbonsäurediester können durch Hydrocarboxyalkylierung von 1,5-Cyclooctadien hergestellt werden. Dazu sind bisher Palladiumkatalysatoren erforderlich.
2.2 Erfindungsgemäß können Cycloctandicarbonsäurediester nun durch Hydrocarboxyalkylierung von 1,5-Cyclooctadien an Kobaltkatalysatoren in Gegenwart tertiärer Amine hergestellt werden.
2.3 Herstellung von Cyclooctandicarbonsäurediestern