A convenient and mild protocol for preparation of α –trimethylsilyloxyphosphonates using sulfamic acid and their oxidation to α – ketophosphonates in the presence of N-bromosuccinimide
<i>O</i>-Allylated Pudovik and Passerini Adducts as Versatile Scaffolds for Product Diversification
作者:Mansour Dolé Kerim、Tania Katsina、Martin Cattoen、Nicolas Fincias、Stellios Arseniyadis、Laurent El Kaïm
DOI:10.1021/acs.joc.0c01721
日期:2020.10.2
The palladium-catalyzed O-allylation of α-hydroxyphosphonates and α-hydroxyamides obtained from Pudovik and Passerini multicomponent reactions has allowed interesting and highly straightforward access to a variety of building blocks for product diversification. These post-functionalizations include a selective base- or ruthenium hydride-mediated isomerization/Claisen rearrangement cascade and a ring-closing
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.
Synthesis and characterization of ytterbium guanidinates stabilized by bridged bis(phenolate) ligand and their application for the hydrophosphonylation reaction of aldehydes
gave the expected ytterbium guanidinato complexes LYb[R2NC(NR1)2] [R1 = Cy, R2N = N(TMS)2 (1), N(CH2)5 (2); R1 = iPr, R2N = N(TMS)2 (3), NPh2 (4)]. These ytterbiumcomplexes were well characterized by elemental analyses, IR spectroscopy and single-crystal X-ray structure determination. The metal ion is six-coordinated by two oxygen and two nitrogen atoms from the bis(phenolate) ligand, and two nitrogen
制备了一系列由胺桥联的双酚盐配体稳定的胍基配合物,并探讨了其对醛的羰基化反应的催化性能。复分解胺桥连的双反应(酚盐)镱氯化物LYbCl(THF)[L =我2 NCH 2 CH 2 N CH 2 - (2-OC 6 H ^ 2吨卜2 -3,5-)} 2 ]与相应的胍基锂在THF中的摩尔比为1:1,得到了预期的胍基络合物LYb [R 2 NC(NR 1)2 ] [R 1 = Cy,R 2 N = N(TMS)2(1),N(CH 2)5(2); R 1 = i Pr,R 2 N = N(TMS)2(3),NPh 2(4)]。这些element配合物通过元素分析,红外光谱和单晶X射线结构测定得到了很好的表征。金属离子由双(酚盐)配体的两个氧和两个氮原子与一个胍基的两个氮原子六配位。around周围的配位几何可描述为扭曲的八面体。已发现这些these胍基络合物是在温和条件下用于各种醛的氢膦酰化反应的高效催化剂。
Rare-earth metal amido complexes supported by bridged bis(β-diketiminato) ligand as efficient catalysts for hydrophosphonylation of aldehydes and ketones
A series of rare-earth metal amides supported by a cyclohexyl-linked bis(β-diketiminato) ligand were synthesized, and their catalytic activities for hydrophosphonylation of aldehydes and ketones were developed. Reaction of [(Me3Si)2N]3RE(µ-Cl)Li(THF)3 with the cyclohexyl-linked bis(β-diketimine) H2L (1) (L = Cy[NC(Me)CHC(Me)NAr]2, Cy = cyclohexyl, Ar = 2, 6-i-Pr2C6H3) gave the rare-earth metal amides
合成了一系列由环己基连接的双(β-二酮亚胺基)配体负载的稀土金属酰胺,并开发了它们对醛和酮进行氢膦酰化的催化活性。[(Me 3 Si)2 N] 3 RE(µ-Cl)Li(THF)3与环己基连接的双(β-二酮亚胺)H 2 L(1)(L = Cy [NC(Me)CHC (Me)NAr] 2,Cy =环己基,Ar = 2,6 - i -Pr 2 C 6 H 3)得到稀土金属酰胺LREN(SiMe 3)2(RE = Nd(2),Sm(3),Dy(4),Er(5),Y(6))。所有复合物均通过元素,光谱和单晶X射线分析得到充分表征。配合物的催化性能研究表明,在稀土金属酰胺(0.1-1 mol%)的室温下,负载量非常低的情况下,这些配合物对醛和酮的氢膦酰化反应显示出高催化活性。短时间。
Hydrophosphonylation of aldehydes catalyzed by cyclopentadienyl ruthenium(II) complexes
作者:Ivânia R. Cabrita、Pedro R. Florindo、Paulo J. Costa、M. Conceição Oliveira、Ana C. Fernandes
DOI:10.1016/j.mcat.2018.03.001
日期:2018.5
This work reports the first method for the synthesis of α-hydroxyphosphonates from aldehydes catalyzed by cyclopentadienyl ruthenium(II) complexes. The best results were obtained using the system HP(O)(OEt)2/[RuClCp(PPh3)2] (5 mol%), affording the α-hydroxyphosphonates in good to excellent yields with high chemoselectivity. The catalyst [RuClCp(PPh3)2] can be used for at least 12 catalytic cycles with