Elaboration of the ether cleaving ability and selectivity of the classical Pearlman's catalyst [Pd(OH)2/C]: concise synthesis of a precursor for a myo-inositol pyrophosphate
作者:Alson Mart、Mysore S. Shashidhar
DOI:10.1016/j.tet.2012.09.016
日期:2012.11
The cleavage of propargyl, allyl, benzyl, and PMB ethers by Pd(OH)2/C can be tuned in that order, by varying the reaction conditions. Other moieties such as C–C double bonds, esters, trityl ether, p-bromo and p-nitrobenzyl ethers are stable to these reaction conditions. Cleavage of allyl ethers can be made catalytic by using 1:1 mixture of Pd(OH)2/C and Pd/C. The synthetic potential of the selective
The Palladium-Catalyzed Anti-Markovnikov Hydroalkylation of Allylic Alcohol Derivatives
作者:Ryan J. DeLuca、Matthew S. Sigman
DOI:10.1021/ol303129p
日期:2013.1.4
A palladium-catalyzed hydroalkylation reaction of protected allylicalcohols using alkylzinc bromide reagents is reported. This account includes numerous allylic, homoallylic, and bishomoallylic alcoholderivatives, all with a uniform selectivity of >20:1 for the anti-Markovnikov product. The reaction features the ability to deliver enantiomerically enriched alcohols in unfunctionalized regions, which
[3+3] Annulation by sequential two electron and one electron allylation
作者:Dale E. Ward、Brian F. Kaller
DOI:10.1016/s0040-4039(00)92100-2
日期:1991.2
3-phenylthio-2-(trimethylsilymethyl)propene is a convenient conjunctive reagent for the preparation of methylenecyclohexanes via a [3+3] annulation. The trimethylsilyl group facilitates the Lewisacid catalyzed allylation of an aldehyde or acetal while the phenylthio group directs a 6-endo-trig radical cyclization reaction.
The Cu(OTf)2-catalyzed alkyl-alkyl coupling reaction of secondaryalkyl sulfonates with RLi-based reagents prepared by transmetalation with soluble MgBr2 ⋅ THF3 in THF proceeded with inversion of the configuration. RLi examined were nBuLi, sBuLi, and Ph(CH2)4Li. In contrast, soluble MgCl2 ⋅ THF2 in THF was suited for MeLi. (S)-14-Methyloctadecan-2-one, a sex pheromone produced by lichen moths, was