Isomerization of Diethyl 1-Alkynylphosphonates to 1,3-Dienylphosphonates Followed by Diels-Alder Reaction with Dead, Maleic Anhydride and Maleimide
摘要:
Isomerization of diethyl 1-alkynylphosphonates, 1, with Pd[(PPh)(3)](4) in refluxing 1,4-dioxane provides 1,3-dienylphosphonates, 2, in satisfactory to excellent isolated yield (45-83%). The reaction is tolerant of chlorides and cyclic substituents. Cycloaddition reaction of 2 with DEAD provided the corresponding diethyl 3-(diethoxyphosphoryl)-6-alkyl-3,6-dihydropyridazine-1,2-dicarboxylates, 3, in 85% isolated yield. The cycloaddition products can be obtained in a one-pot reaction directly from the isomerized 1-alkynylphosphonates with no loss in yields. Similarly, 1,3-dioxo-1,3,3a,4,7,7a-hexahydroisobenzofuran-4-ylphosphonate, and 1,3-dioxo-2,3,3a,4,7,7a-hexahydro-1H-isoindo1-4-ylphosphonate 4 were obtained by reacting 1,3-dienylphosphonates with maleic anhydride and maleimide respectively.
An Efficient and Facile Access to Substituted 1<i>E</i>,3<i>E</i>-Dienylphosphonates<i>via</i>Horner-Wadsworth-Emmons Olefination of α,β-Unsaturated Aldehydes with Tetraethyl Methylenebisphosphonate
作者:Marwa Yahyaoui、Soufiane Touil、Ali Samarat
DOI:10.1246/cl.180149
日期:2018.6.5
operationally simple and high-yielding synthetic method for 1E,3E-dienylphosphonates has been developed through the Horner-Wadsworth-Emmons olefination of α,β-unsaturated aldehydes with tetraethyl methylenebisphosphonate, in heterogeneous medium, in the presence of solid potassium carbonate, in refluxing DMF.
Synthesis of Phosphonomethyl Tetrahydrofurans via the Mori–Tamaru Reaction of Phosphonodienes
作者:Rishi R. Paudel、Jeremy N. Ridenour、Nigam P. Rath、Christopher D. Spilling
DOI:10.1021/acs.orglett.0c01080
日期:2020.5.15
(the Mori-Tamaru reaction) gives hydroxy vinyl phosphonates in good yields with excellent control of the relative stereochemistry. Base-induced cyclization of the vinyl phosphonates yields phosphonomethyl-substituted tetrahydrofurans. Inversion of the hydroxyl stereochemistry by Mitsunobu reaction and then cyclization yields a different set of phosphonomethyl-substituted tetrahydrofuran diastereoisomers
Conjugate addition of lithiated Schöllkopf's bislactim ether to 1E,3E-butadienylphosphonates: Stereocontrolled access to 2,3-anti-4E 2-amino-6-phosphono-4-hexenoic acid derivatives
作者:Vicente Ojea、Susana Conde、María Ruiz、Ma Carmen Fernández、JoséMa Quintela
DOI:10.1016/s0040-4039(97)00888-5
日期:1997.6
Face-selective 1,6-addition of lithiatedSchöllkopf's bislactime ether 5 to 4-substituted, 1,4- or 3,4-disubstituted 1E,3E-butadienylphosphonates6a-d allows a direct and stereocontrolledaccess to semi-rigid AP6 analogues, the 2,3-anti-4E 2-amino-6-phosphono-4-hexenoic acid derivatives 4a-c. The relative stereochemistry was assigned from a NMR study of the cyclic derivative 12c. Ten-membered trans-fused
将锂化的Schöllkopf's bislactime醚5选择性添加到4-取代的1,4或3,4-二取代的1 E,3 E-丁二烯基膦酸酯6a-d上,可以通过面选择性地直接和立体控制地进入半刚性AP6类似物,即2,3-抗-4 E 2-氨基-6-膦酰基-4-己酸衍生物4a-c。从环状衍生物12c的NMR研究确定了相对立体化学。调用十元反式融合的椅子-船状过渡态,以使添加的立体化学结果合理化。
Phosphonates useful as modulators of T-gamma-9-delta-2 activity
申请人:Montero Jean-Louis
公开号:US20100204184A1
公开(公告)日:2010-08-12
The invention concerns novel phosphonate derivatives, preparation method, use thereof as ligands modulating T γ9δ2 lymphocyte activity and pharmaceutical compositions comprising them.
gamma9delta2T cells represent the most abundant population of human blood gammadeltaT lymphocytes. They produce and promote strong cytotoxic activity against many pathogens that are implicated in several human infectious diseases. Their activation requires their exposure to small phosphorus-containing antigens in the family of prenyl pyrophosphates and their related biosynthetic precursors such as isopentenyl pyrophosphate (IPP) and dimethylallyl pyrophosphate (DMAPP), which are naturally occurring metabolites in mycobacteria and several other microbial pathogens. The broad specificity in the recognition of these molecules by the T-lymphocyte population expressing a Vgamma9Vdelta2 cell receptor might facilitate their manipulation by designing small potent synthetic agonist ligands. In this paper, we describe the synthesis and the biological evaluation of new pyrophosphonate compounds as new isosteric analogues of natural prenyl pyrophosphates. Several prenyl and alkenyl pyrophosphonate with different chain lengths and degrees of insaturation (24-28, 48-50, and 64-66) were tested as well as the alkoxymethylpyrophosphonic analogue of IPP (compound 76) as its closest isostere. Several of them appeared to be better activators of Vgamma9Vdelta2 T cell proliferation than IPP. These results open the perspective of a potential use of isoprenoides pyrophosphonates as specific immunoregulatory molecules.