Abstract: Gabapentin enacarbil was prepared and purified from intermediates such as 1-haloalkyl carbamate or carbonate and diacid acetal skeleton. For example, a 1-haloalkyl carbonate or carbamate was prepared by combining a C1 to C10 alcohol or C1 to C10 primary amine, a solvent selected from the group consisting of: acetonitrile, C3 to C7 ketone, C5 to C10 ether, C2 to C7 ester, C5 to C10 hydrocarbon and a combination thereof; a 1-haloalkyl haloformate of the following formula: wherein each X is independently selected from Br, I, or Cl; R1 is alkyl or H; and a C6 to C21 tertiary amine.

Abstract: The present invention provides processes and intermediates for the synthesis of ramelteon.

Abstract: Gabapentin enacarbil was prepared and purified from intermediates such as 1-haloalkyl carbamate or carbonate and diacid acetal skeleton. For example, a 1-haloalkyl carbonate or carbamate was prepared by combining a C1 to C10 alcohol or C1 to C10 primary amine, a solvent selected from the group consisting of: acetonitrile, C3 to C7 ketone, C5 to C10 ether, C2 to C7 ester, C5 to C10 hydrocarbon and a combination thereof; a 1-haloalkyl haloformate of the following formula: wherein each X is independently selected from Br, I, or Cl; R1 is alkyl or H; and a C6 to C21 tertiary amine.

Abstract: Allyl 1 {[(?-isobutanoyloxyethoxy)carbonyl]aminomethyl}-1-cyclohexane acetate can be prepared by combining allyl 1-aminomethyl-1-cyclohexane acetate hydrochloride, a polar organic solvent, chloroethyl chloroformate, and an amine base or an inorganic base selected from a group consisting of carbonate and bicarbonate to provide a reaction mixture; and adding isobutyric acid to the reaction mixture. The product can be purified and/or converted to gabapentin enacarbil.

Abstract: The preparation and use of calcium, barium, magnesium and copper salts of gabapentin enacarbil are described.

Abstract: Gabapentin prodrugs and intermediates thereof are described.

Abstract: An amorphous form of ramelteon is provided, as well as mixtures of amorphous and crystalline ramelteon. Also provided are methods of preparing amorphous ramelteon and mixtures of amorphous and crystalline ramelteon, pharmaceutical compositions comprising amorphous ramelteon and mixtures of amorphous and crystalline ramelteon, and methods of treatment of insomnia using the compositions of the invention.