Metal-catalyzed additions of H–P(O) bonds to carbon–carbon unsaturated bonds

Diastereoselective Synthesis of Adjacent P,C-Stereogenic β-N-Glycosidic Linked α-Aminophosphinates

The diastereoselective formation of adjacent P,C-stereogenic β-N-glycosidic linked α-aminophosphinates is developed in high yields via a phospha-Mannich reaction. The reaction was performed by employing (R_p)-O-(-)-menthyl H-phenylphosphinate and O-pivaloylated N-galactosylimine for double stereodifferentiation and BF₃·Et₂O as a promoter in THF. O-Pivaloylated N-galactosylphenyl imine 2 and (R_p)-O-(-)-menthyl H-phenylphosphinate 1 were converted to N-galactosyl α-aminoalkylphosphinate 3 with ratios of diastereomers up to 20:1. The synthetic method of the conversion provides a rapid access to adjacent P,C-stereogenic chiral α-aminophosphinates.

Activation of the P–H bond by a frustrated Lewis pair and its application in catalytic Z-selective hydrophosphonylation of terminal ynones

Z-Selective hydrophosphonylation of terminal ynones was achieved by employing a frustrated Lewis pair catalyst.

t-BuOK-mediated reductive addition of P(O)–H compounds to terminal alkynes forming β-arylphosphine oxides

A novel and efficient t-BuOK-mediated reductive addition of P(O)–H compounds to terminal alkynes forming β-arylphosphine oxides was developed. This reaction may proceed via a tandem process involving regio-selective addition and subsequent transfer hydrogenation.

PS-BEMP as a basic catalyst for the phospha-Michael addition to electron-poor alkenes

PS-BEMP was used as a heterogeneous catalyst for the phospha-Michael addition of phosphorus nucleophiles to a variety of electron-poor alkenes. The addition reactions were generally performed with equimolar amounts of reagents under solvent free conditions. The protocol proved to be very efficient for the addition to aromatic, non-aromatic and cyclic ketones, giving good yields (78-85%) in all cases. The protocol was also extended with good results to α,β-unsaturated esters and nitriles. This demonstrates that PS-BEMP is a good catalyst for the phospha-Michael addition to electron-poor alkenes.

Asymmetric P-C Bond Formation: Diastereoselective Synthesis of Adjacent P,C-Stereogenic Allylic Phosphorus Compounds

A novel catalytic asymmetric P-C bond formation between phosphinates/phosphine oxide and allylic carbonates was developed. This methodology could not only afford a variety of functionalized adjacent P,C-stereogenic phosphorus compounds in high yields with high regio- and diastereoselectivities but also provide an alternative strategy to access enantiomerically enriched (SP )-phosphinates through kinetic resolution.

Dehydrogenative coupling involving P(O)–H bonds: a powerful way for the preparation of phosphoryl compounds

This Frontier highlights the recent progress in the preparation of organophosphorus compounds via transition metal-catalysed dehydrogenative couplings of P(O)H compounds with Z–H compounds.

Probing the reactivity of H-phosphonate derivatives for the hydrophosphonylation of various alkenes and alkynes under free-radical conditions

Hydrophosphonylation of various alkenes and alkynes is reported using DPAP as a photoinitiator under UV irradiation.

Cu-Catalyzed hydrophosphorylative ring opening of propargyl epoxides: highly selective access to 4-phosphoryl 2,3-allenols

A CuI-catalyzed cross-coupling of propargyl epoxides with P(O)H compounds to produce 4-phosphoryl 2,3-allenols with excellent selectivity under mild conditions is disclosed.

Aerobic addition of secondary phosphine oxides to vinyl sulfides: a shortcut to 1-hydroxy-2-(organosulfanyl)ethyl(diorganyl)phosphine oxides

Secondary phosphine oxides react with vinyl sulfides (both alkyl- and aryl-substituted sulfides) under aerobic and solvent-free conditions (80 °C, air, 7–30 h) to afford 1-hydroxy-2-(organosulfanyl)ethyl(diorganyl)phosphine oxides in 70–93% yields.

Palladium-catalyzed dehydrogenative coupling of terminal alkynes with secondary phosphine oxides

The palladium-catalyzed dehydrogenative coupling of alkynes with secondary phosphine oxides is developed. Thus, in the presence of a silver additive, palladium acetate could efficiently catalyze the dehydrocoupling of secondary phosphine oxides with a variety of alkynes to produce the corresponding alkynylphosphine oxides in high yields. A reaction mechanism is proposed.