The Acid-catalyzed Reaction of Cycloalkanones with Formaldehyde
作者:Fukumi Hirano、Shoji Wakabayashi
DOI:10.1246/bcsj.48.2579
日期:1975.9
The acid-catalyzed reactions of several cycloalkanones, such as cyclopentanone (1a), 2-methylcyclopentanone (1b), cyclohexanone (1c), 2-methylcyclohexanone (1d), and 2-isopropyl-5-methylcyclohexano...
Stereochemistry of the lead(IV) acetate fragmentation of 1-(trimethylsiloxy)bicyclo[n.1.0]alkanes
作者:George M. Rubottom、Ellen C. Beedle、Chong Wan Kim、Robert C. Mott
DOI:10.1021/ja00300a025
日期:1985.7
Preparation des exo- et endo-trimethylsiloxy-1 bicyclo [n.1.0] alcanes methyl-substitues et etude de leurs reactions avec l'acetate de Pb(IV) et le diazomethane pour donner les alcenoates de methyle cis- et trans correspondants. La decomposition est stereospecifique
制备 de exo- et 内-三甲基甲硅烷氧基-1 双环 [n.1.0] 烷烃甲基取代等练习曲 de leurs 反应 avec l'acetate de Pb(IV) et le diazomethane pour donner les alcenoates demethyle cis-et trans 对应物。La 分解 est 立体特异性
The enantioselective synthesis of tetracyclic methyllycaconitine analogues
作者:Kevin Sparrow、David Barker、Margaret A. Brimble
DOI:10.1016/j.tet.2011.08.026
日期:2011.10
A new enantioselective synthesis of ABEF ring analogues of methyllycaconitine has been developed using a chiral cobalt(III) salen-catalyzed Diels-Alder reaction to form the B ring. Subsequent elaboration to form the A, E and F rings was achieved by sequential Dieckmann, Mannich and Wacker-type cyclizations to afford tetracyclic analogues in 97.5% ee. (C) 2011 Elsevier Ltd. All rights reserved.
Diastereoconvergent Negishi Cross-Coupling Using Functionalized Cyclohexylzinc Reagents
作者:Kohei Moriya、Paul Knochel
DOI:10.1021/ol403673e
日期:2014.2.7
Highly diastereoselective Pd-catalyzed cross-coupling reactions of functionalized 2-, 3-, and 4-substituted cyclohexylzinc reagents with aryl, heteroaryl, and alkenyl iodides have been performed under mild conditions. The use of Ruphos (2-dicyclohexylphosphino-2',6'-diisopropoxybiphenyl) as a ligand as well as LiCl and N-ethylpyrrolidone (NEP) as additives leads to especially high diastereoselectivities and displays good functional group tolerance. The stereoselectivity can be explained by assuming that the intermediate palladium moiety occupies an equatorial position of the cyclohexyl ring.
Mannich; Brose, Chemische Berichte, 1923, vol. 56, p. 843