Hot water-promoted cyclopropylcarbinyl rearrangement facilitates construction of homoallylic alcohols
作者:Pei-Fang Li、Cheng-Bo Yi、Jin Qu
DOI:10.1039/c5ob00305a
日期:——
H2O–1,4-dioxane and without an additional catalyst, the rearrangements of various types of cyclopropylcarbinols were attempted. It was found that the reactions generally gave homoallylic alcohols in good to very high chemical yields. Rearrangements of bicyclic or tricyclic cyclopropylcarbinols readily gave the desired ring-expanded cyclic homoallylic alcohols which are difficult to synthesize by other
ASYMMETRIC REDUCTION OF PROCHIRAL CYCLIC KETONES WITH LITHIUM ALUMINUM HYDRIDE PARTIALLY DECOMPOSED BY (1R,2S)-(−)-<i>N</i>-METHYLEPHEDRINE AND 2-ALKYLAMINOPYRIDINE
The title chiral hydride was found to reduce prochiral cyclicketones, affording the corresponding optically active cyclic alcohols in high optical(max. 9 8%ee) yields.
发现标题手性氢化物可还原前手性环酮,以高光学(最大 9 8%ee)产率提供相应的旋光环醇。
Simple strategy for synthesis of optically active allylic alcohols and amines by using enantioselective organocatalysis
作者:Hao Jiang、Nicole Holub、Karl Anker Jørgensen
DOI:10.1073/pnas.0914523107
日期:2010.11.30
A simple organocatalytic one-pot protocol for the construction of opticallyactive allylic alcohols and amines using readily available reactants and catalyst is presented. The described reaction is enabled by an enantioselective enone epoxidation/aziridination-Wharton-reaction sequence affording two highly privileged and synthetically important classes of compounds in an easy and benign way. The advantages
Catalytic enantioselective rearrangement of meso-epoxides mediated by chiral lithium amides in the presence of excess cross-linked polymer-bound lithium amides
作者:Atsushi Seki、Masatoshi Asami
DOI:10.1016/s0040-4020(02)00371-x
日期:2002.6
Insoluble polymer-bound achiral lithium dialkylamides were prepared from the corresponding cross-linked polymer-bound amines and butyllithium. The polymer-bound achiral reagent was applied to a catalytic enantioselective rearrangement of meso-epoxides as an in situ regenerating agent of a chiral lithiumamide. The efficiency of the catalytic system was improved, and chiral allylic alcohol derivatives
New pinene-derived pyridines as bidentate chiral ligands
作者:Andrei V. Malkov、Angus J.P. Stewart-Liddon、Filip Teplý、Lukáš Kobr、Kenneth W. Muir、David Haigh、Pavel Kočovský
DOI:10.1016/j.tet.2008.02.045
日期:2008.4
β-pinene 11. A copper complex of the pyridine–oxazoline ligands 8a has been found to catalyze asymmetric allylic oxidation of cyclic olefins 36a–c with good conversion rates and acceptable enantioselectivity (≤67% ee). The imidazolium salt 10 has been identified as a precursor of the corresponding N,N′-unsymmetrical N-heterocyclic carbene ligand, whose complex with palladiumcatalyzed the intramolecular