- Method for producing symmetrical and asymmetrical carbonates
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Process for the preparation of symmetrical and asymmetrical carbonates of the general formula I by reaction of alcohols of the general formula II and alkyl or aryl halides of the general formula III,R—OH??IIR′—HAL??IIIwith carbon dioxide and caesium carbonate at room temperature in dipolar aprotic solvents.
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Page column 5
(2010/02/06)
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- Kinetic resolution of vinyl carbonates through a lipase-mediated synthesis of their carbonate and carbamate derivatives
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Lipase from Candida antarctica was used in the synthesis of different chiral carbonates and carbamates through the enzymic resolution of the starting racemic vinyl carbonates. A striking feature was the changeover of the enantioselectivity with regard to
- Pozo,Gotor
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p. 10725 - 10732
(2007/10/02)
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- SYNTHESES DE CARBONATES ET CARBAMATES BENZYLIQUES ET ALLYLIQUES
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Different methods for the preparation of carbonates and carbamates derived from 1-phenylethyl, 2-cyclohexenyl and 1-methyl-2-propenyl are described.These conmpounds have been synthesized by the reactions of alcohols, phenols or amines with chloroformiates, imidazolocarbonates or corresponding mixed p-nitrophenylcarbonates. It is shown that these reactions can also be used for the introduction of 1-phenylethyloxycarbonyl - (I), 2-cyclohexenyloxycarbonyl - (II) and 1-methyl-2-propenyloxycarbonyl - (III) groups into alcohols, phenols and amines for the protection of hydroxyls and amino-groups.
- Kryczka, Boguslaw
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p. 147 - 158
(2007/10/02)
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- Vinyl carbonates as novel alkoxycarbonylation reagents in enzymatic synthesis of carbonates
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Carbonates could be obtained by enzymatic alkoxycarbonylation from vinyl carbonates, which are easily prepared from vinyl chloroformate. The reaction was catalyzed by Candida antarctica lipases, SP 435 and SP 435 A. The method could be also used for the synthesis of carbamates. When racemic alcohols were used, lipase catalyzed their resolution, and chiral carbonates were obtained with different enantiomeric excesses depending upon the structure of the alcohol.
- Pozo,Pulido,Gotor
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p. 6477 - 6484
(2007/10/02)
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