Aerobic Oxidative Cross-Coupling of Substituted Acrylamides with Alkenes Catalyzed by an Electron-Deficient CpRh<sup>III</sup> Complex
作者:Ryo Yoshimura、Yu Shibata、Ken Tanaka
DOI:10.1021/acs.joc.9b01733
日期:2019.10.18
It has been established that an electron-deficient CpRhIII complex, bearing two ester moieties on the Cp ring, [CpERhIII], catalyzes the aerobic oxidative cross coupling of substituted acrylamides with both activated and unactivated alkenes, leading to (2Z,4E)-dienamides, at relatively low temperature (80 °C). Importantly, tertiary, secondary, and primary amide directing groups could equally be used
Rhodium-Catalyzed Highly Enantioselective Direct Intermolecular Hydroacylation of 1,1-Disubstituted Alkenes with Unfunctionalized Aldehydes
作者:Yu Shibata、Ken Tanaka
DOI:10.1021/ja905908z
日期:2009.9.9
We have established that a cationic rhodium(I)/(R,R)-QuinoxP* complex catalyzes the highlyenantioselective direct intermolecular hydroacylation of alpha-substituted acrylamides with unfunctionalized aliphatic aldehydes to yield the corresponding gamma-ketoamides in high yields with excellent ee values.
我们已经确定,阳离子铑 (I)/(R,R)-QuinoxP* 复合物催化 α 取代丙烯酰胺与未官能化脂肪醛的高度对映选择性直接分子间加氢酰化反应,以高产率生成相应的 γ-酮酰胺,并具有优异的 ee 值.
A direct functionalization of tertiary alkyl bromides with O-, N-, and C-nucleophiles
作者:Petr Vachal、Joan M. Fletcher、William K. Hagmann
DOI:10.1016/j.tetlet.2007.06.091
日期:2007.8
Silver oxide used in stoichiometric amounts promoted the direct functionalization of tert-alkyl bromides and provided the desired adducts in 39–96% isolated yield. Reaction of tert-bromides with carboxylic acids yielded esters, with alcohols and phenols yielded alkyl and aryl ethers, with amines and anilines yielded selectively mono-alkylated amines and anilines, and with a C-nucleophile yielded an
Samarium(II) Iodide-Mediated Intermolecular Coupling Reactions of N,N-Dibenzylenamides with Carbonyl Compounds and Transformation of the Product, N,N-Dibenzyl-.GAMMA.-hydroxyamide to .DELTA.-Aminoalcohol.
Samarium(II) iodide-mediated intermolecular coupling reactions of N, N-dibenzylenamides (1a-d) with carbonyl compounds (2a-i) produced the corresponding N, N-dibenzyl-γ-hydroxyamides (3a-i) in moderate to good yields.Attempts to remove the two benzyl groups of 3a using hydrogenolysis and Birch reduction were unsuccessful. On the other hand, the lithium aluminum hydride reduction of 3a produced 10 in 61% yield, and dedibenzylation using 20% Pd(OH)2 on carbon gave the corresponding δ-aminoalcohol (11).
α,β-Unsaturated esters and amides were rapidly and selectively reduced to the corresponding saturated ones under mild conditions without affecting coexisting isolated double or triple bonds by using the reduction system, SmI2-N,N-dimethylacetamide (DMA)-proton source.