Allylic Substitution of Esters Derived from 2-Bromocyclohex-2-enol with Aryl Copper Reagents and Synthetic Utilization of the Derived anti SN2′ Products
作者:Yuichi Kobayashi、Atsushi Ikoma
DOI:10.1055/s-0033-1341065
日期:——
Allylic substitution of estersderivedfrom 2-bromocyclohex-2-enol with PhMgBr-based copper reagent was investigated to find high anti S N 2′ selectivity with the diethyl phosphate, whereas other esters such as picolinate, acetate, and mesylate resulted in partial racemization or recovery of the starting esters. This protocol was applied to the copper reagent derivedfrom 2-Me-4-MeOC 6 H 3 MgBr and
研究了衍生自 2-溴环己-2-烯醇的酯与 PhMgBr 基铜试剂的烯丙基取代,以发现与磷酸二乙酯的高抗 SN 2' 选择性,而其他酯如吡啶甲酸酯、乙酸酯和甲磺酸酯导致部分外消旋化或起始酯的回收。该方案应用于衍生自 2-Me-4-MeOC 6 H 3 MgBr 和 CuBr·SMe 2 的铜试剂,并裂解抗 SN 2' 产物的烯烃部分以合成广藿香醇。
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
Catalytic C-H Bond Activation-Asymmetric Olefin Coupling Reaction: The First Example of Asymmetric Fujiwara-Moritani Reaction Catalyzed by Chiral Palladium(II) Complexes
作者:Koichi Mikami、Manabu Hatano、Masahiro Terada
DOI:10.1246/cl.1999.55
日期:1999.1
The firstexample of the asymmetric Fujiwara-Moritani reaction catalyzed by chiral Pd(II) complexes is reported to represent a catalytic aromatic C-H bond activation-asymmetric olefin coupling reaction.
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.
Goldschmidt; Veer, Recueil des Travaux Chimiques des Pays-Bas, 1948, vol. 67, p. 489,506