Zobrazeno 1 - 6
of 6
pro vyhledávání: '"Guido Knühl"'
Autor:
Kerstin Brödner, Dietmar Flubacher, Bolette Ulriksen, Burkhard Wiese, Guido Knühl, Jan W. Prieß, Günter Helmchen
Publikováno v:
European Journal of Organic Chemistry. 2005:3246-3262
A variety of new chiral phosphanes were prepared by highly diastereoselective additions of phosphanes to α,β-unsaturated carbonyl compounds and related acceptor-substituted olefins derived from myrtenal as ex chiral pool source. Monophosphanes with
Publikováno v:
Tetrahedron. 52:971-986
Publikováno v:
Tetrahedron. 51:13031-13038
(-)-Chokol A (10) was prepared in six steps (22% overall yield) via conjugate addition of a higher order cyanocuprate to the chiral 2-oxo-cyclopentenecarboxylate 2n After deprotection by transesterification the enantiomerically pure β-ketoester 5 wa
Publikováno v:
Tetrahedron Letters. 36:7229-7232
Asymmetric shielded 2-oxo-cyclopentenecarboxylates 6n and 6x were prepared by transesterification of 2-oxo-cyclopentanecarboxylate 2 with camphor derived concave alcohols 1n and 1x and by subsequent introduction of a double bond via phenylselenides.
Publikováno v:
Tetrahedron. 51:11149-11164
Asymmetric shielded 2-oxo-cyclopentenecarboxylates 6n and 6x were prepared by transesterification of 2-oxo-cyclopentanecarboxylate 2 with camphor derived concave alcohols 1n and 1x and by subsequent introduction of a double bond via phenylselenides.
Publikováno v:
J. Chem. Soc., Chem. Commun.. :1845-1846
Chiral β-phosphinocarboxylic acids, conveniently available by conjugate addition of lithium diarylphosphides to α,β-unsaturated carboxylic esters from the chiral pool, show excellent potential as ligands in asymmetric catalysis; in Pd-catalysed al