Reactions of stoichiometric higher order, mixed lithio magnesio organocuprates
作者:Bruce H. Lipshutz、David A. Parker、Sam L. Nguyen、Keith E. McCarthy、John C. Barton、Scott E. Whitney、Hiyoshizo Kotsuki
DOI:10.1016/s0040-4020(01)90576-9
日期:1986.1
2-lithiothiophene and RMgX. Reactions of various members of this new class of reagents are described, including substitution and conjugateaddition processes, where the ligand derived from the Grignard reagent is selectively transferred. The effects of added BF3.Et2O are discussed. Some comparison reactions with the corresponding lower order reagents, RCu(CN)MgBr, have also been carried out. Evidence is presented
Conjugate addition to α,β-unsaturated ketones with mixed lithium triorganozincates
作者:Randall A. Watson、Richard A. Kjonaas
DOI:10.1016/s0040-4039(00)84279-3
日期:1986.1
Lithium Triorganozincates of the type RR′2ZnLi, where R′ = Me and R = n-Bu or sec-Bu, efficiently transfer the R group in a 1,4 fashion to α,β-unsaturated ketones.
RR'2 ZnLi类型的三有机锌酸锂(其中R'= Me且R = n -Bu或sec-Bu)有效地将R基团以1,4方式转移至α,β-不饱和酮。
3-Metallierte Enamine XI<sup>1</sup>Transmetallierung 3-stannylierter Enamine<sup>2</sup>- Eine neue Methode zur Herstellung von 1-Aminoallyllithium-Verbindungen
作者:Hubertus Ahlbrecht、Peter Weber
DOI:10.1055/s-1992-26292
日期:——
3-Metallated Enamines XI1 Transmetallation of 3-Stannylated Enamines2 - a New Method to Generate 1-Aminoallyllithium Compounds The transmetallation of 3-stannylated enamines,3 1-morpholino-3-(trialkylstannyl)cycloalk-1-enes and 3-morpholino-5-(tributylstannyl)hex-3-ene, with butyllithium is a new and general way to generate 1-aminoallyllithium compounds. Stabilization by aromatic substituents is not further necessary as in the case of preparation by deprotonation and even the thermodynamically less stable exo- amino derivatives are accessible. Therefore homoenolate-equiva- lents of cyclic ketones are made available. Thus, the corresponding 3-alkylated or 3-silylated cycloalkanones and alken-3-ones were prepared via the 1-morpholinoallyllithium compounds.