Studies on the Base-Promoted Conversion of Conjugated Alkynyl Esters to α-Substituted α-Allenyl Esters
作者:Salvatore D. Lepore、Yuanjun He、Pamela Damisse
DOI:10.1021/jo0487754
日期:2004.12.1
variety of conjugated alkynyl esters to α-substituted conjugated allenyl esters (racemic) through the use of strong amide bases. Substantially improved yields over typical enolate formation conditions were observed with the use of 2 equiv of lithium diisopropylamide. Trapping studies indicate that the second equivalent of base likely leads to the dianion intermediate, which upon addition of methyl iodide
The Intramolecular Allenolate Rauhut–Currier Reaction
作者:James A. MacKay、Zachary C. Landis、Stephen E. Motika、Margaret H. Kench
DOI:10.1021/jo3015769
日期:2012.9.7
intramolecular Rauhut–Currierreaction utilizing alkynoates as the initial conjugate acceptor affords densely functionalized 5- and 6-membered rings from ynoate-enoate, ynoate-enenitrile, and alkynyl sulfone-enenitrile substrates. Trialkylphosphines catalyze the reaction, and TMSCN serves as a pronucelophile to effect turnover of the catalyst and the formation of a second C–C bond. Because of the highly electrophilic
Reaction of (trimethylstanyl)copper(I) reagents with α,β-acettylenic esters
作者:Edward Piers、J.Michael Chong、Howard E. Morton
DOI:10.1016/0040-4020(89)80065-1
日期:1989.1
The reactions of α,β-actylenic esters 1 with the (trimethylstannyl) copper (I) reagents 4–7 provide good to excellent yields of the corresponding β-trimethylstannyl α,β-unsaturated esters 10 and (or) 11. In nearly all cases studied, except for the reactions involving substrate 1i, the stereochemical outcome of the transformations can be controlled by judicious choice of reagent and (or) reaction conditions
Synthesis of multi-substituted vinylsilanes via copper(<scp>i</scp>)-catalyzed hydrosilylation reactions of allenes and propiolate derivatives with silylboronates
作者:Yun-He Xu、Liu-Hai Wu、Jun Wang、Teck-Peng Loh
DOI:10.1039/c4cc01722f
日期:——
An efficient and general copper(i)-catalyzed method for the synthesis of multi-substituted vinylsilanes is reported.
报道了一种高效且通用的铜(i)催化合成多取代乙烯硅烷的方法。
Strong base induced intramolecular cycloaddition of homophthalic anhydrides leading to polycyclic peri-hydroxy aromatic compounds
A strong base-induced intramolecular cycloaddition reaction homophthalicanhydride has been examined as a method for preparing polycyclic perihydroxy aromatic compounds.