- A Short Access to Symmetrically α,α-Disubstituted α-Amino Acids from Acyl Cyanohydrins
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A straightforward synthesis of symmetrically α,α-disubstituted α-amino acids is presented. The key step of this process relies on the efficient double addition of Grignard reagents to acyl cyanohydrins to provide N-acyl amino alcohols selectively in good yields. The chemoselectivity of the reaction was modulated by the nature of the acyl moiety. Eleven amino acids were prepared, including the particularly simple divinylglycine, which is not easily accessible by using conventional methods.
- Boukattaya, Fatma,Caillé, Julien,Ammar, Houcine,Rouzier, Florian,Boeda, Fabien,Pearson-Long, Morwenna S. M.,Bertus, Philippe
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p. 906 - 916
(2016/03/12)
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- Pyrrolidine and related derivatives useful as PR modulators
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Compounds of the following structure are described: wherein R1-R6, R11, R12, m, V, X, Y, Z and Q are described herein, or a pharmaceutically acceptable salt, tautomer, metabolite or prodrug thereof. These compou
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Page/Page column 16
(2010/11/30)
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- Tricyclic oxazolidone derivatives useful as PR modulators
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Compounds of the following structure are described: wherein R1-R6, R16, m, V, W, X, Y, and Q are described herein, or a pharmaceutically acceptable salt, tautomer, metabolite or prodrug thereof. These compounds are use
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Page/Page column 16
(2008/06/13)
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- Oxazolidone derivatives as PR modulators
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Compounds of the following structure are described: wherein R1, R2, R5, R6, V, X, Y, Z and Q are described herein, or a pharmaceutically acceptable salt, tautomer, metabolite or prodrug thereof. These compounds are useful for treating a variety of hormone-related conditions including contraception, treating or preventing fibroids, endometriosis, dysfunctional bleeding, uterine leiomyomata, polycystic ovary syndrome, or hormone-dependent carcinomas, providing hormone replacement therapy, stimulating food intake or synchronizing estrus.
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Page/Page column 21
(2008/06/13)
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- Oxazolidine derivatives as PR modulators
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Compounds of the following structure are described: wherein R1-R6, m, V, W, X, Y, Z and Q are described herein, or a pharmaceutically acceptable salt, tautomer, metabolite or prodrug thereof. These compounds are useful for treating a
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Page/Page column 15
(2010/11/30)
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- Imidazolidin-2-one derivatives useful as PR modulators
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Compounds of the following structure are described: wherein R1-R6, R10, m, V, X, Y, Z and Q are described herein, or a pharmaceutically acceptable salt, tautomer, metabolite or prodrug thereof. These compounds are useful f
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Page/Page column 15
(2010/11/30)
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- Enantioselective Cyclopropanation of Allylic Alcohols. The Effect of Zinc Iodide
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The effect of zinc iodide on the catalytic, enantioselective cyclopropanation of aliylic alcohols is examined with bis(iodomethyl)zinc as the reagent and bis-methanesulfonamide 7 as the catalyst. Significant rate enhancement was observed when 1 equiv of zinc iodide was present, but more importantly, the enantiomeric excess of the product cyclopropane increased from 80% to 89% for the substrate cinnamyl alcohol. Reaction studies and spectroscopic investigations show that this remarkable influence is the result of reagent modification via a Schlenk equilibrium that produces the more reactive and selective species (iodomethyl)zinc iodide.
- Denmark, Scott E.,O'Connor, Stephen P.
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p. 3375 - 3389
(2007/10/03)
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- Electroorganic chemistry; 145: Coupling reaction of an olefin with a radical NO.3 generated by anodic oxidation of NO-3
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When NO-3 is electrochemically oxidized in the presence of a variety of terminal and 1,2-disubstituted olefins 1 in a mixed solvent system (MeCN:H2O:Et2O = 10:2:1), a radical NO.3 is generated from NO-3 and nitrate esters 3 are formed by a new coupling reaction of the olefin with the radical. The products 3 can be further transformed into the corresponding alcohols 4 and alkyl iodides 5. Under the same reaction conditions, 1,1-di- and 1,1,2-trisubstituted olefins 6 do not give nitrate esters but afford oxazoline derivatives 7. (1S,5S)-(-)-β-Pinene (13) is diastereoselectively transformed into (1S,2R,5S)-(-)-myrtanol (14) by this technique.
- Shono,Chuankamnerdkarn,Maekawa,Ishifune,Kashimura
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p. 895 - 897
(2007/10/02)
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- Substituted pyridines
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This invention relates to substituted pyridines prepared by reacting aldehydes, amines, lower carboxylic acids such as acetic acid in the presence of oxygen. The N-substituted pyridinium salts formed can be converted to pyridines by thermal dealkylation. The reactions can be summarized by the following equations: STR1
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