I. V. Chuchelkin

Palladium-catalyzed enantioselective allylation in the presence of phosphoramidites derived from (Sa)-3-SiMe3-BINOL, (R,S)-semi-TADDOL, and (R,R)-TADDOL

Novel P*- and P-monodentate phosphoramidites of a 1,3,2-dioxaphosphepine series were derived from (Sa)-3-trimethylsilyl-BINOL, (R,S)-semi-TADDOL, and (R,R)-TADDOL. Catalytic performance of the synthesized compounds were examined in the Pd-catalyzed asymmetric allylic substitution of (E)-1,3-diphenylallyl acetate: the reaction with dimethyl malonate gave up to 92% ee. The effects of additives of 5,10,15,20-tetraphenylporphyrin and its metal complexes on conversion and enantioselectivity were studied.

Pd-Catalyzed asymmetric transformations involving P*-mono- and P*,N-bidentate diamidophosphites derived from (2S,3S)-N2,3-dimethyl-N1-phenylpentane-1,2-diamine

The synthesis of new P*-mono- and P*,N-bidentate diamidophosphites, containing 1,3,2-diazaphospholidine rings formed starting from (2S,3S)-N2,3-dimethyl-N1-phenylpentane-1,2-diamine, is described. Comparison of their efficiency in the Pd-catalyzed enantioselective allylation with (E)-1,3-diphenylallyl acetate showed that up to 97% ee was reached in the reaction involving dimethyl malonate as a C-nucleophile. The Pd-catalyzed desymmetrization of N,N′-ditosyl-meso-cyclopent-4-ene-1,3-diol biscarbamate gave up to 61% ee.

Chiral phosphite-type ligands based on ((4 R ,5 R )-2,2-dimethyl-1,3-dioxolane-4,5-diyl)bis(diphenylmethanol) (( R , R )-TADDOL) with peripheral arylamino groups

New phosphite and amidophosphite inductors of chirality were obtained based on ((4R,5R)-2,2-dimethyl-1,3-dioxolane-4,5-diyl)bis(diphenylmethanol) ((R,R)-TADDOL) containing arylamino groups in the exocyclic substituents. Their use in the palladium-catalyzed enantioselective alkylation of (E)-1,3-diphenylallyl acetate with dimethyl malonate gave the ee value up to 98%.

Palladium and rhodium-catalyzed enantioselective reactions mediated by pseudodipeptide-based phosphite-type ligand

P*-Chiral diamidophosphite ligand of a 1,3,2-diazaphopholidine series bearing the exocyclic pseudodipeptide fragment was synthesized. The possibility of its application in the palladium- and rhodium-catalyzed asymmetric transformations was demonstrated. This ligand provided up to 84% ee in the Pd-catalyzed alkylation of (E)-1,3-diphenylallyl acetate with dimethyl malonate, up to 56% ee in amination of this substrate with pyrrolidine, and up to 68% ee in alkylation of cinnamyl acetate with ethyl 2-oxocyclohexane-1-carboxylate. In the Rh-catalyzed hydrogenation of (Z)-methyl 2-acetamido-3-phenylacrylate mediated by this ligand, up to 53% ee was achieved.

Diastereomeric bisamidophosphites based on oxalamide 1,3-diol in asymmetric metal complex catalysis

Diastereomeric P*,P*-bisdiamidophosphite ligands of the 1,3,2-diazaphospholidine series bearing an oxalamide moiety have been synthesized. A possibility of their application in palladium- and rhodium-catalyzed asymmetric transformations was demonstrated. In Pd-catalyzed sulfonylation of (E)-1,3-diphenylallyl acetate with sodium p-toluenesulfinate enantioselectivity of up to 57% ee, in alkylation with dimethyl malonate of up to 77% ee, in amination with pyrrolidine of up to 78% ee, and in alkylation of cinnamyl acetate with ethyl 2-oxocyclohexane-1-carboxylate of up to 52% ee, in Rh-catalyzed hydrogenation of (Z-methyl 2-acetamido-3-phenylacrylate of up to 88% ee was achieved. An effi ciency of diastereomeric chirality inducers was compared.

Phosphine-phosphoramidites with 2-(diphenylphosphino)-ethylamine or N-methyl-2-(diphenylphosphino)ethylamine fragments

GRAPHICAL ABSTRACT ABSTRACT New phosphine-phosphoramidite ligands based on (R)-[1,1′-binaphthalene]-2,2′-diol, containing exocyclic fragment of 2-(diphenylphosphanyl)ethan-1-amine or 2-(diphenylphosphanyl)-N-methylethan-1-amine were obtained and characterized by 31P, 1H, and 13C NMR spectroscopy.