60456-21-5Relevant articles and documents
Synthesis of Phosphatidylserine and Its Stereoisomers: Their Role in Activation of Blood Coagulation
Mallik, Suman,Prasad, Ramesh,Bhattacharya, Anindita,Sen, Prosenjit
supporting information, p. 434 - 439 (2018/05/23)
Natural phosphatidylserine (PS), which contains two chiral centers, enhances blood coagulation. However, the process by which PS enhanced blood coagulation is not completely understood. An efficient and flexible synthetic route has been developed to synthesize all of the possible stereoisomers of PS. In this study, we examined the role of PS chiral centers in modulating the activity of the tissue factor (TF)-factor VIIa coagulation initiation complex. Full length TF was relipidated with phosphatidylcholine, and the synthesized PS isomers were individually used to estimate the procoagulant activity of the TF-FVIIa complex via a FXa generation assay. The results revealed that the initiation complex activity was stereoselective and had increased sensitivity to the configuration of the PS glycerol backbone due to optimal protein-lipid interactions.
Practical one-pot synthesis of protected l-glyceraldehyde derivatives
Stecko, Sebastian,Michalak, Micha,Stodulski, MacIej,Muchal, Lukasz,Parda, Kamil,Furman, Bartlomiej,Chmielewski, Marek
, p. 2695 - 2698 (2012/11/07)
A large-scale, simple, economic, and safe procedure for the preparation of l-glyceraldehyde acetonide under conditions, which allow its direct transformation (one-pot) into the desired products (acetylene, imine, nitrone, unsaturated ester) is reported. l-Glyceraldehyde acetonide is obtained from the corresponding ester, which is readily available from l-serine. Georg Thieme Verlag Stuttgart New York.
d- and l-Serine, useful synthons for the synthesis of 24-hydroxyvitamin D3 metabolites. A formal synthesis of 1α,24R,25-(OH)3-D3, 24R,25-(OH)2-D3 and 24S,25-(OH)2-D3
Fernandez, Carlos,Gándara, Zoila,Gómez, Generosa,Covelo, Berta,Fall, Yagamare
, p. 2939 - 2942 (2008/02/03)
d- and l-Serine have been used for the enantioselective synthesis of tosylates 7a and 7b, useful building blocks for the synthesis of triols 5a and 5b which have already been obtained via a diastereoselective synthesis and used for the synthesis of 2a, 2b and 2c. We have thus performed a formal synthesis of 24S,25-(OH)2-D3, 24R,25-(OH)2-D3 and 1α,24R,25-(OH)3-D3.
Hydrolytic kinetic resolution of epoxides catalyzed by chromium(III)-endo, endo-2,5-diaminonorbornane-salen [Cr(III)-DIANANE-salen] complexes. Improved activity, low catalyst loading
Berkessel, Albrecht,Ertuerk, Erkan
, p. 2619 - 2625 (2007/10/03)
The hydrolytic kinetic resolution (HKR) of terminal epoxides, using chiral chromium(III)-salen catalysts based on DIANANE (endo,endo-2,5-diaminonorbornane) , was studied. A broad substrate scope was found for the chromium(III)-DIANANE catalysts, and very low loadings (down to 0.05 mol%) were needed to achieve high enantiomeric purities of both the remaining epoxides and the product diols (up to >99% ee). Besides monosubstituted epoxides, 2-methyl-2-n-pentyloxirane, which is an example for 2,2-disubstituted epoxides, could be ring-opened in an asymmetric fashion with water in the presence of an electronically tuned chromium-(III)-DIANANE complex.
Synthesis of (S)-1-(1H-indol-4-yloxy)-3[4-(3-methoxyphenyl)-4- hydroxypiperidin-1-yl]-propan-2-ol (LY333068) succinate, and its 3-[14C]- isotopomer based on chiral glycerol-[14C] derivatives
Czeskis, Boris A.
, p. 465 - 475 (2007/10/03)
The 3-[14C]-isotopomer of (S)-1-(1H-indol-4-yloxy)-3-[4-(3- methoxyphenyl)-4-hydroxypiperidin-1-yl]-propan-2-ol (LY333068), a 5HT(1A) antagonist, was prepared in 10 steps and 8.2% radiochemical yield from (L)- serine-[3-14C]. Deamination, esterification, and protection of the resulting diol gave methyl (R)2,2-dimethyl-1,3-dioxolane-4-carboxylate-[3- 14C], as a chiral and radiolabeled building block, which then was subsequently coupled with 4-hydroxyindole and 4-(3-methoxyphenyl)-4- hydroxypiperidine to give the titled product with 99.4% radiochemical purity.
Asymmetric synthesis of RK-682 and its analogs, and evaluation of their protein phosphatase inhibitory activities
Sodeoka, Mikiko,Sampe, Ruriko,Kagamizono, Terumi,Osada, Hiroyuki
, p. 8775 - 8778 (2007/10/03)
We report an asymmetric synthesis of a potent tyrosine phosphatase inhibitor, RK-682 and its analogs. The absolute stereochemistry of RK-682 was determined to be (R). The inhibitory activities of RK-682 and its analogs, (R)-1a, (S)-1a, (R)-1b and (R)-1c toward various protein phosphatases (VHR, cdc25A, cdc25B, and PPI) are also reported.
Enzymes in Organic Synthesis, 15. Synthesis of Methyl (S)-(-)-2,3-O-Isopropylideneglycerate by Enantioselective Enzyme-Catalyzed Hydrolysis of Methyl (+/-)-2,3-O-Isopropylideneglycerate
Schick, Hans,Schroetter, Eberhard,Szymanowski, Matthias,Knoll, Alexander
, p. 103 - 104 (2007/10/02)
In contrast to porcine pancreatic lipase (PPL), the serine proteases aP 41 and thermitase are suited as catalysts for the enantioselective ester hydrolysis of methyl (+/-)-2,3-O-isopropylideneglycerate (rac-1).These enzymes allow the preparation of methyl (S)-(-)-2,3-O-isopropylideneglycerate (1) with an enantiomeric excess of 84-87percent in a yield of 19-27percent related to the starting racemate. Key Words: Enzymes / Proteases / Ester hydrolysis, enzymatic / Isopropylideneglycerates / Resolution, kinetic / Glycerates
Oxidative Cleavage of Vicinal Diols at the Nickel Hydroxide Electrode
Ruholl, Heinrich,Schaefer, Hans J.
, p. 54 - 56 (2007/10/02)
Vicinal diols are oxidatively cleaved with good yields by electrolysis at an oxide covered nickel electrode in an aqueous alkaline electrolyte and an undivided cell.The method is applied in the synthesis of optical pure derivatives of 2,2-dimethyl-1,3-dioxolane-4-carboxylic acid.
Convenient One-Pot Conversion of Alcohols into Esters via Hemiacetal Intermediates
Lichtenthaler, Frieder W.,Jarglis, Pan,Lorenz, Klaus
, p. 790 - 792 (2007/10/02)
A simple and efficient one-pot oxidative procedure, adaptable to a large scale, is described for the preparation of methyl esters from either primary alcohols or vic-diols.The aldehyde is generated by Swern or periodate oxidation, followed by bromine oxidation of the methyl hemiacetal formed in aqueous methanolic solution.
L-(S)-ERYTHRULOSE A NOVEL PRECURSOR TO L-2,3-O-ISOPROPYLIDENE-C3 CHIRONS
Wilde, H. De,Clercq, P. De,Vandewalle, M.,Roeper, H.
, p. 4757 - 4758 (2007/10/02)
Starting from L-(S)-erythrulose, now available in larger quantities, the preparation of L-(S)-glyceraldehyde, L-(R)-glycerol and L-(S)-methyl glycerate acetonides, via the protected L-(S)-3,4-O-isopropylideneerythrulose, is described.