It was found that the reaction of O-silylated enolates of carboxylicesters and of lactones with aminomethyl ethers proceeds smoothly under a catalytic action of zinc chloride to afford the corresponding α-aminomethylated carboxylicesters or lactones, except only one case using O-silylated enolate of δ-valerolactone, in which the resultant α-aminomethyl-δ-valerolactone is somewhat unstable and undergoes
作者:Yongzheng Qu、Zheyuan Wang、Zhongchao Zhang、Wendou Zhang、Jun Huang、Zhen Yang
DOI:10.1021/jacs.0c02143
日期:2020.4.8
The asymmetric total synthesis of (+)-waihoensene, which has a cis-fused [6,5,5,5] tetracyclic core bearing an angulartriquinane, a cis-fused six-membered ring, and four contiguous quaternary car-bon atoms, was achieved through a sequence of chemical reac-tions in a stereochemically well-defined manner. The total synthe-sis features: 1) Cu-catalyzed asymmetric conjugated 1,4-addition; 2) diastereoselective
Synthesis of new functionalized aminomethylphosphonites and their derivatives
作者:Andrey A. Prishchenko、Mikhail V. Livantsov、Olga P. Novikova、Ludmila I. Livantsova、Valery S. Petrosyan
DOI:10.1002/hc.20620
日期:——
aminomethylation of the several esters of hypophosphorous acid using chloro-, alkoxy-, and amino-substituted methylamines of various structure is proposed as convenient method for the synthesis of newfunctionalizedaminomethylphosphonites and bis(aminomethyl)phosphinates. Also O,O-diethyl(pivaloyl)phosphonite is successfully applied in the aminomethylation as a synthetic analog of unstable diethoxyphosphine.
The first catalyticenantioselective total synthesis of riccardiphenol B, a sesquiterpene derivative isolated from a Japanese collection of the liverwort Riccardia crassa, has been achieved. A copper‐catalyzed asymmetric conjugate addition of trimethylaluminum was used at an early stage to generate the quaternary stereogenic center with high enantiomeric excess. The corresponding sterically encumbered
Étude de la synthése, la structure et la réactivité d'un nouveau réactif organométallique résultant d'une réaction de dimérisation du bromure d'allyl-zinc
作者:Gilles Courtois、Leone Miginiac
DOI:10.1016/s0022-328x(00)95144-1
日期:1973.5
When heated for several hours in refluxing solvent, allylzinc bromide forms a new organometallic compound with a bis-1,3-organozinc structure. This compound reacts with different compounds leading in most cases to attachment of the structural group: