[Rh(diphosphine) (diene)]ClO 4 et [Rh(diphosphine)(S) 4 ]ClO 4 (diphosphine: diphosphine tertiaire chelatant-cis; diene=cyclooctadiene ou norbornadiene; S =溶剂)。Ces 组成sont des catalyseurs actifs de la migration d'hydrogene dans les allylamines secondaires et tertiaires pour donner les (E)-enamines et 亚胺通讯员
diastereoselective method was developed for the [2,3]-sigmatropic rearrangement of N-allyl ammonium ylides, affording products in up to 95% isolated yields and up to 97:3 dr; most of the desired products were formed within 1 minute. For the asymmetric reaction, a chiral auxiliary was introduced to the starting compound, affording the rearrangement product with high diastereoselectivities. A rapid and diastereoselective
Ruthenium Porphyrin Catalyzed Tandem Sulfonium/Ammonium Ylide Formation and [2,3]-Sigmatropic Rearrangement. A Concise Synthesis of (±)-Platynecine
作者:Cong-Ying Zhou、Wing-Yiu Yu、Philip Wai Hong Chan、Chi-Ming Che
DOI:10.1021/jo049540v
日期:2004.10.1
allyl sulfides such as crotyl sulfide produced an equimolar mixture of anti- and syn-2-(ethylthio)-3-methyl-4-pentenoic acidethyl ester. The analogous “EDA + N,N-dimethylcrotylamine” reaction afforded a mixture of anti- and syn-2-(N,N-dimethylamino)-3-methyl-4-pentenoic acidethyl esters with a diastereoselectivity of 3:1. The observed catalytic activity of [RuII(TTP)(CO)] for the ylide [2,3]-sigmatropic
ADDITION OF AMINES TO CONJUGATED DIENES CATALYZED BY SOLID BASE CATALYSTS
作者:Yumiko Kakuno、Hideshi Hattori、Kozo Tanabe
DOI:10.1246/cl.1982.2015
日期:1982.12.5
Addition of dimethylamine, ethylamine, and piperidine to 1,3-butadiene or 2-methyl-1,3-butadiene effectively occurred over solid base catalysts such as MgO, CaO, SrO, La2O3, and ThO2. Among these catalysts, CaO exhibited the highest activity.
Highly effective catalytic methods for ylide generation from diazo compounds. Mechanism of the rhodium- and copper-catalyzed reactions with allylic compounds
作者:Michael P. Doyle、William H. Tamblyn、Vahid Bagheri