296766-73-9Relevant articles and documents
Expeditious novel routes to enantiopure 3-amino tetrahydrofuran hydrochloride
Ramanujam, Rajendran,Ganjihal, Savita,Kalyanam, Nagabushanam,Majeed, Muhammed
, p. 663 - 668 (2013/07/11)
The synthesis of chemically and enantiomerically pure (S)-3-amino tetrahydrofuran hydrochloride starting from the natural amino acids, l-aspartic acid or l-methionine is described. The process involves no chromatography and can be easily carried out on a large scale. The enantiopurity of the final product was established by NMR and chiral HPLC methods.
Improved catalysts for the iridium-catalyzed asymmetric isomerization of primary allylic alcohols based on charton analysis
Mantilli, Luca,Gerard, David,Torche, Sonya,Besnard, Celine,Mazet, Clement
supporting information; experimental part, p. 12736 - 12745 (2011/02/21)
An improved generation of chiral cationic iridium catalysts for the asymmetric isomerization of primary allylic alcohols is disclosed. The design of these air-stable complexes relied on the preliminary mechanistic information available, and on Charton analyses using two preceding generations of iridium catalysts developed for this highly challenging transformation. Sterically unbiased chiral aldehydes that were not accessible previously have been obtained with high levels of enantioselectivity, thus validating the initial hypothesis regarding the selected ligand-design elements. A rationale for the high enantioselectivities achieved in most cases is also presented. Achieving enantioselectivity: An improved generation of chiral cationic iridium catalysts for the asymmetric isomerization of primary allylic alcohols is disclosed. The design of these air-stable complexes relies on preliminary mechanistic information and on Charton analyses using two preceding generations of iridium catalysts developed for this highly challenging transformation (see figure).
Processes for the Manufacture of Chiral and Racemic Forms of 3-Aminotetrahydrofurans, Their Salts and Derivatives
-
Page/Page column 3, (2008/12/04)
A novel process for the synthesis of (S)-3-Amino-tetrahydrofuran and (R)-3-Amino-tetrahydrofuran is described. The process is applicable for substituted chiral-3-aminotetrahydrofuran derivatives.
Toward the development of chemoprevention agents. Part 1: Design, synthesis, and anti-inflammatory activities of a new class of 2,5-disubstituted-dioxacycloalkanes
Gu, Keli,Bi, Lanrong,Zhao, Ming,Wang, Chao,Ju, Jingfang,Peng, Shiqi
, p. 4775 - 4799 (2008/03/14)
A new class of 2,5-disubstituted-dioxacycloalkanes were designed and synthesized via stereoselective synthetic method as cancer chemoprevention agents. The anti-inflammatory activities of these compounds were tested using the xylene-induced mouse ear edema model. Some of these compounds exhibited comparable or better anti-inflammatory activities than that of aspirin suggesting that they can be further developed as potential anti-inflammatory drug lead compounds. In addition, treatment of these anti-inflammatory agents did not prolong tail bleeding time in mice. The structure/activity relationships were also analyzed among these compounds.
Modular chiral selenium-containing oxazolines: Synthesis and application in the palladium-catalyzed asymmetric allylic alkylation
Braga, Antonio L.,Lüdtke, Diogo S.,Sehnem, Jasquer A.,Alberto, Eduardo E.
, p. 11664 - 11671 (2007/10/03)
A new series of modular chiral selenium-containing oxazolines has been synthesized from inexpensive and commercially available l-serine and l-aspartic acid. These new compounds were evaluated as chiral ligands in the palladium-catalyzed asymmetric allylic
5-Benzoylamino-1,3-dioxacyclanes, the method for preparing the same and their use as PKC inhibitor
-
Page/Page column 3, (2008/06/13)
The present invention discloses a series of benzoylamino-1,3-dioxacyclane compounds, of which compounds 1-21 were prepared via transacetalisation reaction between N-benzoylaminoglycol and 1,1,3,3-tetramethoxypropane; while compounds 22-48 were prepared vi
Optically active iridium imidazol-2-ylidene-oxazoline complexes: Preparation and use in asymmetric hydrogenation of arylalkenes
Perry, Marc C.,Cui, Xiuhua,Powell, Mark T.,Hou, Duen-Ren,Reibenspies, Joseph H.,Burgess, Kevin
, p. 113 - 123 (2007/10/03)
This work explores the potential of iridium complexes of the N-heterocyclic carbene oxazoline ligands 1 in asymmetric hydrogenations of arylalkenes. The accessible carbene precursors, imidazolium salts 2, and robust iridium complexes 5 facilitated a disco
New, optically active phosphine oxazoline (JM-phos) ligands: Syntheses and applications in allylation reactions
Hou,Reibenspies,Burgess
, p. 206 - 215 (2007/10/03)
Three different syntheses of the phosphine oxazoline systems 1 are presented. Two of these approaches are divergent routes designed to involve an advanced intermediate that can be transformed into several different end-products. The third is a shorter route specifically designed to facilitate preparations of these systems on a larger scale using minimal functional group protection. Overall, eight different phosphine oxazolines were prepared. These were screened in several palladium-mediated allylation reactions. They proved to be most useful for asymmetric alkylation of 3-acetoxy-1,3-diphenylpropene and less suitable/effective for the more challenging substrates (a pentenyl derivative and a cyclohexenyl system). X-ray crystallographic analysis of the complex [(η3-PhCHCHCHPh)Pd(1a)][PF6] led to the conclusion that the origins of asymmetric induction in these systems might be indirectly attributed to interaction of the oxazoline-phenyl substituent with the palladium and with an allyl-phenyl substituent. Finally, data is presented for allylation of a silylenolate of an N-acyl oxazolidinone; excellent enantioselectivities and yields were obtained.
Stereoselective transacetalization of 1,1,3,3-tetramethoxypropane and N- benzoylaminodiols
Bi, Lanrong,Zhao, Ming,Wang, Chao,Peng, Shiqi
, p. 2669 - 2676 (2007/10/03)
The transacetalization of 1,1,3,3-tetramethoxypropane and an N- benzoylaminodiol provided stereoselectively the corresponding 2,5- disubstituted-1,3-dioxanes. The stereochemistry of the rings formed in the transacetalization depended on the structure of the amino diol, and the ratio of the products depended on the reaction conditions, as expected. This kind of stereoselective transacetalization not only gives a series of useful building blocks but also generates interesting 1,3-dioxanes which target protein kinase C.