A new synthesis of 2,5-anhydro-D-mannose derivatives

1988 ◽  
Vol 66 (12) ◽  
pp. 2975-2980 ◽  
Author(s):  
Juan A. López Sastre ◽  
José Molina Molina ◽  
Dolores Portal Olea ◽  
Cristina Romero-Avila
Keyword(s):  
Sodium Methoxide ◽  
Reduction Product ◽  
Diethyl Acetal ◽  
New Synthesis ◽  
Mannose Derivatives

Penta-O-acetyl-D-glucose diethyl dithioacetal monoxide 3 was obtained by oxidation of penta-O-acetyl-D-glucose diethyl dithioacetal 2 with 3-chloroperbenzoic acid. By reaction of 3 with sodium methoxide in methanol and further acetylation, 3,4,6-tri-O-acetyl-2,5-anhydro-D-mannose-diethyl dithioacetal monoxide 8 and the reduction product 3,4,6-tri-O-acetyl-2,5-anhydro-1,1-bis(ethylthio)-1-deoxy-D-arabino-hex-1-enitol 4 were obtained. Reduction of 8 yielded the corresponding dithioacetal derivative 9, which was converted to 3,4,6-tri-O-acetyl-2,5-anhydro-D-mannose diethyl acetal 11.

scholarly journals New synthesis of S-alkyl-DL-homocysteines

1969 ◽  
Vol 47 (17) ◽  
pp. 3271-3273 ◽  
Author(s):  
Harold M. Kolenbrander
Keyword(s):  
Sodium Methoxide ◽  
Alkyl Halide ◽  
Simple Method ◽  
Homocysteine Thiolactone ◽  
New Synthesis ◽  
Sodium Methoxide Solution

A simple method for the synthesis of S-alkyl-DL-homocysteines is described. The method involves the reaction of homocysteine thiolactone with a primary alkyl halide in sodium methoxide solution.

A new synthesis of β-amino acids by use of ketene diethyl acetal as enolate equivalent

2005 ◽  
Vol 46 (11) ◽  
pp. 1819-1821 ◽  
Author(s):  
Kai Rossen ◽  
Pavol Jakubec ◽  
Michael Kiesel ◽  
Matthias Janik
Keyword(s):  
Amino Acids ◽  
Diethyl Acetal ◽  
New Synthesis

A New Synthesis of Iodoacetaldehyde Diethyl Acetal

1952 ◽  
Vol 74 (22) ◽  
pp. 5759-5759 ◽  
Author(s):  
Saburo Akiyoshi ◽  
Kenzo Okuno
Keyword(s):  
Diethyl Acetal ◽  
New Synthesis

THE PREPARATION OF 3-ALKYLTHIOINDOLES

1965 ◽  
Vol 43 (5) ◽  
pp. 1293-1297 ◽  
Author(s):  
R. V. Jardine ◽  
R. K. Brown
Keyword(s):  
Sodium Borohydride ◽  
Condensation Product ◽  
Ethyl Iodide ◽  
Reduction Product ◽  
Diethyl Acetal ◽  
Borohydride Reduction ◽  
Phosphorus Pentasulfide ◽  
Fischer Cyclization ◽  
Sodium Borohydride Reduction

3-Ethylthioindole has been prepared by Fischer cyclization of the condensation product of phenylhydrazine and ethylthioacetaldehyde diethyl acetal, and also by a route involving the reaction of ethyl iodide with the sodium borohydride reduction product of 1,2-dithiolo[4,3-b]indole-3-(4H)-thione. The last-named compound was obtained by reaction of 2-carbethoxy-indoxyl with phosphorus pentasulfide.

ChemInform Abstract: A New Synthesis of 2,5-Anhydro-D-mannose Derivatives.

ChemInform ◽  
1989 ◽  
Vol 20 (21) ◽  
Author(s):  
J. A. LOPEZ SASTRE ◽  
J. MOLINA MOLINA ◽  
D. PORTAL OLEA ◽  
C. ROMERO-AVILA
Keyword(s):  
New Synthesis ◽  
Mannose Derivatives

Preparation of 1,6:3,4-dianhydro-β-D-altropyranose as starting substance for the synthesis of 3-substituted D-mannose derivatives

1982 ◽  
Vol 47 (9) ◽  
pp. 2415-2422 ◽  
Author(s):  
Jitka Doležalová ◽  
Tomáš Trnka ◽  
Miloslav Černý
Keyword(s):  
Acetic Acid ◽  
Acetic Anhydride ◽  
Sodium Methoxide ◽  
Hydrogen Bromide ◽  
Mannose Derivatives

Acetolysis of 1,6 : 3,4-dianhydro-2-O-p-toluenesulfonyl-β-D-galactopyranose (I) gave 3,4-di-O-acetyl-1,6-anhydro-2-O-p-toluenesulfonyl-β-D-glucopyranose (II) which was converted with sodium methoxide to 1,6 : 3,4-dianhydro-β-D-altropyranose (X). The 1,6-anhydride bond in diacetate II was cleaved with acetic anhydride or hydrogen bromide in acetic acid under formation of a mixture of anomeric tetraacetates of 2-O-p-toluenesulfonyl-D-glucopyranose or the corresponding acetates of α-D-glucopyranosyl bromide XIII and its 6-bromo-6-deoxy derivative XIV.

A New Synthesis of β-Amino Acids by Use of Ketene Diethyl Acetal as Enolate Equivalent.

ChemInform ◽  
2005 ◽  
Vol 36 (28) ◽  
Author(s):  
Kai Rossen ◽  
Pavol Jakubec ◽  
Michael Kiesel ◽  
Matthias Janik
Keyword(s):  
Amino Acids ◽  
Diethyl Acetal ◽  
New Synthesis

Immunocytochemical localization of desmin and vimentin in chick embryonic myocardial cells

1990 ◽  
Vol 48 (3) ◽  
pp. 448-449
Author(s):  
Yukiko Sugi
Keyword(s):  
Sodium Methoxide ◽  
Intermediate Filament Protein ◽  
Chick Embryos ◽  
Immunocytochemical Localization ◽  
Myocardial Cells ◽  
Immunofluorescence Study ◽  
Immunofluorescent Localization ◽  
Rabbit Igg ◽  
Semithin Sections ◽  
Filament Protein

In cultured skeletal muscle cells of chick, one intermediate filament protein, vimentin, is primarily formed and then synthesis of desmin follows. Coexistence of vimentin and desmin has been immunocytochemically confirmed in chick embryonic skeletal musclecells. Immunofluorescent localization of vimentin and desmin has been described in developing myocardial cells of hamster. However, initial localization of desmin and vimentin in early embryonic heart has not been reported in detail. By quick-freeze deep-etch method a loose network of intermediate filaments was revealed to exist surrounding myofibrils. In this report, immunocytochemical localization of desmin and vimentin is visualized in early stages of chick embryonic my ocardium.Chick embryos, Hamburger-Hamilton (H-H) stage 8 to hatch, and 1 day old postnatal chicks were used in this study. For immunofluorescence study, each embryo was fixed with 4% paraformaldehyde and embedded in Epon 812. De-epoxinized with sodium methoxide, semithin sections were stained with primary antibodies (rabbit anti-desmin antibody and anti-vimentin antibody)and secondary antibody (RITC conjugated goat-anti rabbit IgG).

Tandem Carbon-Radical Peroxidation−Addition to Carbonyl Groups Reaction. A New Synthesis of Steroidal β-Peroxy Lactones

1996 ◽  
Vol 61 (26) ◽  
pp. 9635-9635
Author(s):  
Alicia Boto ◽  
Rosendo Hernández ◽  
Ernesto Suárez ◽  
Carmen Betancor ◽  
María S. Rodríguez
Keyword(s):  
Carbonyl Groups ◽  
New Synthesis
Sign in / Sign up

Export Citation Format

Share Document