Diastereoselective synthesis of α-silylphosphetanes. An approach to monodentate, PO chelating and trans-chelating chiral ligands
作者:Angela Marinetti、Virginie Kruger、Claude Le Menn、Louis Ricard
DOI:10.1016/0022-328x(96)06289-4
日期:1996.9
Optically pure alpha-silylphosphetanes have been prepared through stereoselective metallation-silylation reactions of the P-menthylphosphetane oxide 1. Bridging of two phosphetane units by means of bifunctional chlorosilanes leads to various bidentate ligands and, particularly, to the chiral, trans-chelating diphosphine 6b. Its square planar rhodium complex trans-Rh(CO)Cl(6b) has been structurally characterized.
Synthesis and characterization of some p-methylphosphetanes, a new class of electron-rich chiral phosphines
作者:Angela Marinetti、Louis Ricard
DOI:10.1016/s0040-4020(01)80558-5
日期:1993.1
phosphetane oxides 4 and 6 are prepared either by starting from (methyl)PCl2 and an appropriate olefin, or by reacting (methyl)MgCl with a 1-chlorophosphetane. Highly selective alkylation and halogenation reactions of the corresponding anions 4′ afford α-substituted derivatives in diastereomerically pure form. Reductions of the phosphetane oxides with HSiCl3.Et3N proceed with retention of configuration about
New chiral phosphetanes: Synthesis and use in the palladium-catalyzed allylic alkylation
作者:Angela Marinetti、Virginie Kruger、Louis Ricard
DOI:10.1016/s0022-328x(96)06563-1
日期:1997.2
The new chiral phosphetane—acetals 4a–d and 10a–d were synthesized and evaluated as coligands for the palladium-catalyzedallylicalkylation of 1,3-diphenyl-2-propenyl acetate with sodium malonate. For each set of epimeric phosphetanes, the enantiomeric excesses are highly dependent on the relative configurations of the various chiral centers. The highest asymmetric induction was observed with phosphetane