137156-22-0Relevant articles and documents
Diastereoselective formation of 18-membered ring BINOL-hydrogen phosphonate dimers - Quasicovalent hydrogen bonds?
Dabbagh, Hossein A.,Noroozl-Pesyan, Nader,Najafl-Chermahini, Ali R.,Patrick, Brian O.,James, Brian R.
, p. 466 - 474 (2007)
Diastereoselective syntheses of the unusual dimers, 4-heptyl-2-(2′- hydroxy-binaphthyl)hydrogen phosphonate (5) and the cyclohexyl analogue (7), are achieved by hydrolysis of 4-(3,5-dioxa-4-phosphacyclohepta[2,1-α;3,4- α′]dinaphthalene-4-yloxy)heptane (4)
Asymmetric hydrocyanation of olefins catalyzed by chiral diphosphite-nickel complexes
Yan, Ming,Xu, Qian-Yong,Chan, Albert S.C.
, p. 845 - 849 (2000)
Chiral aryl diphosphite ligands derived from binaphthol were found to be effective in the nickel-catalyzed hydrocyanation of a variety of olefins. Enantioselective hydrocyanations of styrene, 4-substituted styrenes and norbornene were achieved with excell
On the use of seven-membered phosphorous heterocycles based on 2,2′-dihydroxy-1,1′-binaphthalene and 1,4:3,6-dianhydro-D-mannitol in the 31P NMR analysis of the enantiomeric composition of chiral alcohols
Bredikhin,Bredikhina,Nigmatzyanov
, p. 411 - 416 (1998)
Some aspects of phosphorylation of 2,2′-dihydroxy-1,1′-binaphthalene (BINOL) and 1,4:3,6-dianhydro-D-mannitol (isomannide) were investigated. The possibility of using the corresponding cyclic chloro-and amidophosphites for the analysis of enantiomeric com
New catalysts for the asymmetric hydrosilylation of ketones discovered by mass spectrometry screening
Yao, Sulan,Meng, Jun-Cai,Siuzdak, Gary,Finn
, p. 2540 - 2546 (2003)
A method for determining enantiomeric excess by mass spectrometry was employed to screen a family of chiral phosphite P,N-ligands for activity in the rhodium-catalyzed asymmetric hydrosilylation of ketones. The identification of an effective set of ligand
Total Synthesis of (±)-Impatien A via Aza-Heck Cyclization
Korch, Katerina M.,Watson, Donald A.
supporting information, p. 7285 - 7289 (2021/09/14)
The first total synthesis of the natural product impatien A is described. This concise synthesis features an aza-Heck cyclization to construct the complex spirocyclic ring system and provides a rare example of the use of aza-Heck cyclizations in complex molecule synthesis. To enable this key cyclization of an electrophilic nitrogen atom with a tetrasubstituted alkene, we utilized high-throughput experimentation to identify a new ligand and ultimately deliver impatien A in seven steps from known compounds.
Asymmetric Domino Heck/Dearomatization Reaction of β-Naphthols to Construct Indole-Terpenoid Frameworks
Wang, Dong-Chao,Cheng, Peng-Peng,Yang, Ting-Ting,Wu, Pan-Pan,Qu, Gui-Rong,Guo, Hai-Ming
supporting information, p. 7865 - 7872 (2021/10/20)
A palladium-catalyzed enantioselective Heck cyclization/dearomatization cascade via capturing the cyclized Heck π-allylpalladium intermediate by β-naphthols is reported, which provides a new strategy for the construction of chiral indole-terpenoid framewo
P-chirogenic diphosphazanes with axially chiral substituents and their use in rh-catalyzed asymmetric hydrogenation
Moritz, Jan-Ole,Chakrabortty, Soumyadeep,Bernd H. Mu.ller,Spannenberg, Anke,Kamer, Paul C. J.
, p. 14537 - 14544 (2020/12/29)
A convenient synthesis of enantiopure P-chirogenic diphosphazanes incorporating bulky bisphenol and 1,1′-bi-2-naphtholderived substituents via the functionalization of a readily accessible enantiopure lithium phosphinoamide with chlorophosphoridites was developed. Since the product requires no subsequent deprotection, the protocol provides an easy, convenient synthesis of P-chirogenic ligands on the gram scale. The ligands were applied in the Rh-catalyzed asymmetric hydrogenation of benchmark substrates furnishing enantiomeric excess values up to 96%.
Rh(i)-Catalyzed enantioselective and scalable [4 + 2] cycloaddition of 1,3-dienes with dialkyl acetylenedicarboxylates
Bao, Robert Li-Yuan,Yin, Junjie,Shi, Lei,Zheng, Limin
supporting information, p. 2956 - 2961 (2020/04/28)
An asymmetric intermolecular [4 + 2] cycloaddition of 1,3-dienes with dialkyl acetylenedicarboxylates, which was catalyzed by a rhodium(i)-chiral phosphoramidite complex, was developed. This protocol provided a highly enantioselective access to prepare carbonyl substituted cyclohexa-1,4-dienes with up to 96% yield and >99% ee. Notably, a cycloaddition on the 10 g scale gave the product in 92% yield and with 99% ee, which showed great potential for the scale-up synthesis of carbonyl substituted cyclohexa-1,4-dienes. In addition, oxidative aromatizations and hydrolysis of the products were also investigated.
ORGANOPHOSPHORUS COMPOUNDS, CATALYTIC SYSTEMS COMPRISING SAID COMPOUNDS AND METHOD OF HYDROCYANATION USING SAID CATALYTIC SYSTEMS
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Paragraph 0090-0093, (2013/03/26)
The present invention relates to organophosphorus compounds belonging to the phosphinite-phosphite family, catalytic systems comprising a metallic element forming a complex with said phosphinite-phosphite compounds and methods of hydrocyanation employed in the presence of said catalytic systems.
Palladium-catalyzed enantioselective allylic alkylations through C-H activation
Trost, Barry M.,Thaisrivongs, David A.,Donckele, Etienne J.
supporting information, p. 1523 - 1526 (2013/04/10)
A new ligand class: The title reaction was made possible by the discovery of a new class of phosphoramidite ligands. A variety of sterically and electronically diverse allylarenes undergo reaction with 2-acetyl-1-tetralones to form quaternary carbon stereocenters. This is a conceptually and mechanistically distinct strategy from traditional methods for the synthesis of enantioenriched allylic substitution products. 2,6-DMBQ=2,6- dimethylbenzoquinone. Copyright