Ir-catalysed allylic substitution: mechanistic aspects and asymmetric synthesis with phosphorus amidites as ligands
作者:Björn Bartels、Günter Helmchen
DOI:10.1039/a900864k
日期:——
Ir-catalysed allylic alkylations of enantiomerically enriched monosubstituted allylic acetates proceed with up to 79% retention of configuration using P(OPh)3 as ligand; further evidence supports the assumption of σ-allyl complexes as intermediates, and high regio- and enantioselectivity in asymmetric allylic alkylations of achiral or racemic substrates is achieved with phosphorus amidites as ligands.
Synthesis of Tubuphenylalanines via Ireland–Claisen Rearrangement
作者:Dominic Becker、Uli Kazmaier
DOI:10.1021/jo301693d
日期:2013.1.4
The Ireland–Claisenrearrangement is the central step in the synthesis of tubuphenylalanine, a key building block of the highly antitumor-active tubulysins. The rearrangement of substituted β-amino acid allyl esters, in combination with subsequent decarboxylation and oxidative cleavage of the double bond, allows the highly stereoselective introduction of substituents into the α-position of the resulting
Palladium-Catalyzed Enantioselective Allylic Alkylation of Thiocarboxylate Ions: Asymmetric Synthesis of Allylic Thioesters and Memory Effect/Dynamic Kinetic Resolution of Allylic Esters
作者:Bernhard J. Lüssem、Hans-Joachim Gais
DOI:10.1021/jo049756x
日期:2004.6.1
matched acetate of ≥99% ee and the mismatched acetate of ≥99% ee with KSAc. The acetates not only reacted with different enantioselectivities and rates but also suffered an unexpected and concomitant palladium-catalyzed racemization in the presence of the chiral ligand. This led in the case of the mismatched acetate to a temporary dynamic kinetic resolution (DKR) that featured a racemization of the
Correction to Synthesis of Enantioenriched Tertiary Boronic Esters from Secondary Allylic Carbamates. Application to the Synthesis of C30 Botryococcene
作者:Alexander P. Pulis、Varinder K. Aggarwal
DOI:10.1021/ja304872j
日期:2012.7.11
Wessel Tania Elaine, Berson Jerome A., J. Amer. Chem. Soc, 116 (1994) N 2, S 495-505