Palladium-Catalyzed Negishi Cross-Coupling Reactions of Unactivated Alkyl Iodides, Bromides, Chlorides, and Tosylates
作者:Jianrong Zhou、Gregory C. Fu
DOI:10.1021/ja0363258
日期:2003.10.1
A single method (2% Pd(2)(dba)(3)/8% PCyp(3)/NMI in THF/NMP at 80 degrees C; Cyp = cyclopentyl) achieves the cross-coupling of a range of beta-hydrogen-containing primary alkyliodides, bromides, chlorides, and tosylates with an array of alkyl-, alkenyl-, and arylzinc halides. The process is compatible with a variety of functional groups, including esters, amides, imides, nitriles, and heterocycles
Combining Q2MM modeling and kinetic studies for refinement of the osmium-catalyzed asymmetric dihydroxylation (AD) mnemonic
作者:Peter Fristrup、Gitte Holm Jensen、Marie Louise Nygaard Andersen、David Tanner、Per-Ola Norrby
DOI:10.1016/j.jorganchem.2005.11.009
日期:2006.5
the Sharpless AD reaction have been examined in detail, using a combination of substrate competition experiments and molecular modeling of transition states. There is a good agreement between computational and experimental results, in particular for the stereoselectivity of the reaction. The influence of each moiety in the second-generation ligand (DHQD)2PHAL on the rate and selectivity of the reaction