Stereoselective Modification of <i>N</i>-(α-Hydroxyacyl)-glycinesters via Palladium-Catalyzed Allylic Alkylation
作者:Alexander Horn、Uli Kazmaier
DOI:10.1021/acs.orglett.9b01497
日期:2019.6.21
excellent nucleophiles in Pd-catalyzed allylic alkylation. The method allows for the stereoselective introduction of a wide range of side chains, including highly functionalized ones. Both diastereomers can be accessed through variation of the reaction conditions. Furthermore, the use of stannylated carbonates introduces vinylstannane motifs, which are eligible for subsequent C–C coupling reactions.
Stereoselective palladium-catalyzed allylic alkylations of peptideamide enolates
作者:Swarup Datta、Uli Kazmaier
DOI:10.1039/c0ob00628a
日期:——
Pd-catalyzed allylations are an excellent tool for stereoselectivepeptide modifications, being clearly superior to normal alkylations. The reactions proceed not only in high yield, but also high regio- and diastereoselectivities, and trans-products are formed exclusively. Therefore, this is a powerful synthetic tool for natural product and drug synthesis.
Optimization of asymmetric hydrogenation of 3-phenyl-3-butenoic acid catalyzed by rhodium(I)-4,5-bis[(diphenylphosphino)methyl]-2,2-dimethyldioxolane (DIOP)
作者:Keiji Yamamoto、Kiyoshi Ikeda、Leong Kwai Yin
DOI:10.1016/0022-328x(89)87295-x
日期:1989.7
homogeneous hydrogenation of 3-phenyl-3-butenoic acid (1) has extensively been examined in the presence of the rhodium(I)/4,5-bis[(diphenylphosphino)methyl]-2,2-dimethyldioxolane (DIOP) catalyst systems. Optimization of the reaction conditions was undertaken mainly by controlling effects of added tertiary amines as well as solvent polarities on the enantio-selectivity of the product. The best asymmetric yield
Highly stereoselective modifications of peptides via Pd-catalyzed allylic alkylation of internal peptide amide enolates
作者:Swarup Datta、Anton Bayer、Uli Kazmaier
DOI:10.1039/c2ob26351c
日期:——
Pd-catalyzed allylations are excellent tools for stereoselectivepeptide modifications, showing several advantages compared to normal alkylations. Reactions of internal peptide amide enolates with Pd–allyl complexes proceed not only with high yields of up to 86%, they show also high regio- and diastereoselectivities (88–99%), giving rise to the trans-configured products. Therefore, this protocol is