The Mechanism of Double Olefination Using Titanium-Substituted Ylides
作者:Kelly A. Reynolds、M. G. Finn
DOI:10.1021/jo9610016
日期:1997.4.1
aldehydes is proposed to arise from the presence of a chloride leaving group on the metal. Isolated vinylphosphoniumcompounds may be deprotonated with phenyllithium to give thermally sensitive allenic phosphoranes, which have been characterized by low temperature multinuclear NMR. The reaction of allenic phosphoranes with aldehydes affords oxaphosphetane and betaine intermediates which appear to interconvert
A silver(I) catalyzed regioselective trifluoromethylation of allenes using Langlois's salt (NaOSOCF3) is demonstrated. This transformation enables direct expedient access to α‐trifluoromethylated acroleins, which are valuable synthons for a number of pharmaceuticals and agrochemicals containing vinyl‐CF3 moieties. Versatility of this trifluoromethylation method has been established with good yield
Rh(I)-Catalyzed Insertion of Allenes into C–C Bonds of Benzocyclobutenols
作者:Chunliang Zhao、Li-Chuan Liu、Jing Wang、Chenran Jiang、Qing-Wei Zhang、Wei He
DOI:10.1021/acs.orglett.5b03518
日期:2016.1.15
Herein we report a Rh(I)-catalyzed two carbon insertion into C–C bonds of benzocyclobutenols by employing symmetrical and unsymmetrical allenes. This reaction provides rapid access to alkylidene tetralins bearing two adjacent stereogenic centers in good yields and diasteroselectivities.
Gold(I)-Catalyzed Enantioselective Intermolecular Hydroarylation of Allenes with Indoles and Reaction Mechanism by Density Functional Theory Calculations
作者:Ming-Zhong Wang、Cong-Ying Zhou、Zhen Guo、Ella Lai-Ming Wong、Man-Kin Wong、Chi-Ming Che
DOI:10.1002/asia.201000651
日期:2011.3.1
Chiral binuclear gold(I) phosphine complexes catalyze enantioselective intermolecular hydroarylation of allenes with indoles in high product yields (up to 90 %) and with moderate enantioselectivities (up to 63 % ee). Among the gold(I) complexes examined, better ee values were obtained with binuclear gold(I) complexes, which displayed intramolecular AuIAuI interactions. The binuclear gold(I) complex 4c
Vinylphosphonium Salts and Allenes from Carbonyl Compounds Using Titanium-Substituted Ylides
作者:Kelly A. Reynolds、Pablo G. Dopico、Marcus S. Brody、M. G. Finn
DOI:10.1021/jo961000d
日期:1997.4.1
allene synthesis. This methodology, along with a previously reported one-pot reaction, comprises the most convenient route available for the synthesis of 1,3-disubstituted allenes. The metal-substituted ylide reagent may be generated in situ from commercially-available startingmaterials. Two representative vinylphosphonium salts were shown to undergo reversible isomerization to the (Z)-form upon irradiation