Stereoselective Synthesis of Polysubstituted Alkenes through a Phosphine-Mediated Three-Component System of Aldehydes, α-Halo Carbonyl Compounds, and Terminal Alkenes
作者:Da-Neng Liu、Shi-Kai Tian
DOI:10.1002/chem.200900177
日期:2009.4.27
mediate the one‐pot Wittig reaction of aldehydes with α‐halo carbonylcompounds for the synthesis of 1,2‐disubstituted and trisubstituted alkenes in an excellent stereoselective fashion. Furthermore, the first one‐pot, three‐component reaction of aldehydes, α‐halo acetates, and terminalalkenes has been developed in the presence of PPh3 to produce trisubstituted alkenes with excellent E selectivity (see
Intramolecular Nucleophilic Acyl Substitution Reactions Mediated by XTi(O-<i>i</i>-Pr)<sub>3</sub> (X = Cl, O-<i>i</i>-Pr)/2<i>i-</i>PrMgBr Reagent. Efficient Synthesis of Functionalized Organotitanium Compounds from Unsaturated Compounds
作者:Sentaro Okamoto、Aleksandr Kasatkin、P. K. Zubaidha、Fumie Sato
DOI:10.1021/ja953497z
日期:1996.1.1
readily generated by the reaction of Ti(O-i-Pr)4 or ClTi(O-i-Pr)3 with 2i-PrMgX, resulted in an intramolecular nucleophilic acyl substitution (INAS) reaction to afford organotitanium compounds having a carbonyl functional group, in good to excellent yields. Thus, the treatment of alkyl alkynyl carbonates 2 or alkyl alkenyl carbonates 4 with 1 gave organotitanium compounds having a lactone and/or ester
Stereoselective Synthesis of (<i>E</i>)- or (<i>Z</i>)-α-Alkylidene-γ-butyrolactone from γ-Butyrolactone and Bis[ethoxy(thiocarbonyl)] Disulfide and Mechanistic Studies of the Effect of Metal Complexes on the Stereoselection
作者:Syuichi Matsui
DOI:10.1246/bcsj.60.1853
日期:1987.5
with an aldehyde to afford exclusively (E)-α-alkylidene-γ-butyrolactone. Interestingly, when the reaction was quenched below −20 °C or when it was carried out in the presence of metal complex such as zinc chloride, copper(I) iodide, or tributyltin chloride, (Z)-α-alkylidene-γ-butyrolactone was obtained as the major product. The stereoselectivity of this reaction was sensitive to the reaction temperature
A SIMPLE, STEREOCONTROLLED SYNTHESIS OF α-ALKYLIDENE-γ-BUTYROLACTONES
作者:Kazuhiko Tanaka、Norikazu Tamura、Aritsune Kaji
DOI:10.1246/cl.1980.595
日期:1980.5.5
Treatment of γ-butyrolactone with bis[methoxy(thiocarbonyl)] disulfide in the presence of 2.2 equivalents of lithium diisopropylamide followed by the addition of aldehydes gave predominantly (E)-α-alkylidene-γ-butyrolactones. In contrast, when the reaction was carried out in the presence of metal salt such as cuprous iodide or zinc chloride, (Z)-α-alkylidene-γ-butyrolactone was obtained as the major
Intramolecular nucleophilic acyl substitution reactions mediated by reagent. Synthesis of vinyltitanium compounds having a lactone and/or an ester group from acetylenic carbonates
作者:Aleksandr Kasatkin、Sentaro Okamoto、Fumie Sato
DOI:10.1016/0040-4039(95)01207-x
日期:1995.8
carbonates of acetylenic alcohols reacted with diisopropoxy(η2-propene)titanium to give the alkenyltitanium compounds containing lactone ring and/or an estergroup by intramolecular nucleophilic acyl substitution reaction. Condensation of the reaction products with aldehydes afforded substituted butenolides.