Direct preparation of benzylic manganese reagents from benzyl halides, sulfonates, and phosphates and their reactions: applications in organic synthesis
作者:YoungSung Suh、Jun-sik Lee、Seoung-Hoi Kim、Reuben D Rieke
DOI:10.1016/s0022-328x(03)00500-x
日期:2003.11
The use of highly active manganese (Mn)*, prepared by the Rieke method, was investigated for the direct preparation of benzylic manganese reagents. The oxidative addition of the highly active manganese to benzylic halides was easily completed under mild conditions. Moreover, benzylic manganese sulfonates and phosphates were prepared by direct oxidative addition of Mn* to the carbon–oxygen bonds of
Palladium-catalysed<i>O</i>-Allylation of α-Hydroxyphosphonates: An Expedient Entry into Phosphono-oxaheterocycles
作者:Mansour Dolé Kerim、Martin Cattoen、Nicolas Fincias、Aurélie Dos Santos、Stellios Arseniyadis、Laurent El Kaïm
DOI:10.1002/adsc.201701150
日期:2018.2.1
We report here an unprecedented palladium-catalysed O-allylation of α-hydroxyphosphonates. The method was eventually included in a sequential Pudovik/Tsuji-Trost type O-allylation/Ring-Closing Metathesis to afford a variety of phosphorylated heterocycles of various sizes ranging from 5 to 16 starting from readily available aldehydes.
Suzuki−Miyaura Cross-Coupling of Benzylic Phosphates with Arylboronic Acids
作者:Mark McLaughlin
DOI:10.1021/ol0517271
日期:2005.10.1
[reaction: see text] Suzuki-Miyauracross-coupling of benzylic phosphates with arylboronicacids was investigated. Optimum conditions employed the simple catalytic system of palladium(II) acetate (1 mol %) and triphenylphosphine (4 mol %) with either potassium phosphate or potassium carbonate as the base and toluene as the solvent at 90 degrees C. Using the developed conditions, a series of structurally
Palladium/Xiao‐Phos‐Catalyzed Kinetic Resolution of
<i>sec</i>
‐Phosphine Oxides by
<i>P</i>
‐Benzylation
作者:Qiang Dai、Lu Liu、Junliang Zhang
DOI:10.1002/anie.202111957
日期:2021.12.20
rac-secondary phosphine oxides via the enantioselective P-benzylation process catalyzed by the palladium/Xiao-Phos was designed. Both, tert- and sec-phosphine oxides were delivered in good yield and excellent enantiopurity (selectivity factor up to 226.1). The synthetic utilities are further demonstrated by the facile preparation of several P-chiral compounds, precursors of bidentate ligands, and transition
Al(OTf)3 exhibits superior catalyst performance in the Friedel–Crafts‐type benzylation using benzylicphosphate as an electrophile. The reaction can be conducted even with 0.2 mol‐% of the catalyst. Twenty‐one different diarylmethanes are formed. The chemoselective property of the catalyst toward the phosphate group over acetate and bromide is noteworthy.