Synthesis of 5- and 6-Acyl-1-cyano and -1-ethoxycarbonyl Cycloalkenes
摘要:
Conjugated addition of primary nitroalkanes to the functional acetates 3 and 4 in basic medium, leads to the cyclic nitroesters 5 and nitronitriles 6. These derivatives are easily converted via the Nef reaction to the corresponding gamma-ketoestesrs 7 and gamma-ketonitriles 8 in good yields.
Substitution nucleophile d'acetates de cyclenols allyliques fonctionnels par des organometalliques en presence de sels cuivreux. Application a une synthese rapide de la (±)mitsugashiw alactone
作者:Hassen Amri、Monique Rambaud、Jean Villieras
DOI:10.1016/s0040-4020(01)81522-2
日期:1990.1
Substitution of functional allylic cycloalkenol acetates by Grignardreagents (primary , secondary, tertiary-alkyl, vinyl, aryl) in the presence of a catalytic amount (2.5% equivalent) of cuprous iodide at low temperature, gives high yields of various functional α-substituted cycloalkenes . The reaction can be applied to lithium enolates of esters and need no catalyst, but may be performed with HMPA
Efficient Palladium-Catalyzed Nucleophilic Addition of Triorganoindium Reagents to Carbocyclic Derivatives
作者:Lucas Baker、Thomas Minehan
DOI:10.1021/jo0357162
日期:2004.5.1
Palladium (0)-catalyzed allylic substitution reactions employing triorganoindium reagents have been investigated. In situ generated vinyl- and arylindiums react with substituted and unsubstituted cyclohex-2-enyl esters in the presence of 1-3 mol % Pd-2(dba)(3) to produce vinyl- or arylcyclohexenes in moderate to excellent yields. The stereoselectivity of this process was also examined, and evidence is presented that the reaction proceeds with inversion of stereochemical configuration.
Short Synthesis of Functionalized Cyclic Homoallylsilanes
作者:Rim Ouled Saad、Taoufik Turki、Hassen Amri
DOI:10.1080/00397910500297370
日期:2005.11
The synthesis of functionalized cyclic homoallylsilanes 5 and 6 was described starting from functional cycloalkenols 1 and 2, in which the addition of silylcuprate to the functional acetates 3 and 4 were used as the key reaction step.