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ChemicalBook CAS DataBase List Gabapentin
60142-96-3

Gabapentin synthesis

8synthesis methods
In the original synthesis (Goedecke) cyclohexenone is reacted with ethyl cyanoacetate in the presence of ammonia to yield the Guareschi salt, which is hydrolyzed and decarboxylated to give 1,1-cyclohexanediacetic acid which is transformed by to the corresponding anhydride with acetic anhydride. This anhydride is treated with methanol to yield the half ester 2- acetic acid, which is subjected to a Curtius type rearrangement to give the isocyanate 2-acetic acid. The desired compound is obtained by hydrolysis of 2-acetic acid with HCl, followed by hydrochloric salt removal via anion exchange .
Synthesis_60142-96-3
-

Yield:60142-96-3 98%

Reaction Conditions:

in tetrahydrofuran;water;

Steps:

39.39 Synthesis of Compound 1

Example 39 Synthesis of Compound 1 Lithium aluminum hydride (69.4 mL of a 1 M solution in ether, 69.4 mmol) was added dropwise to a stirring solution of cis-cyclobutane-1,2-dicarboxylic acid (5 g, 34.7 mmol) in THF (60 mL) at 0° C. under argon. The mixture was allowed to warm to room temperature and stirred for 16 hours. The mixture was cooled to 0° C. and quenched by careful addition of water (2.7 mL), sodium hydroxide solution (2.7 mL of a 15% w/v solution), and water (8.1 mL). The mixture was stirred for 15 minutes, and the precipitate was removed by filtration. The solvent was evaporated under reduced pressure to give the alcohol 1 as a colorless oil (4.0 g, 98%); δH (400 MHz; CDCl3): 3.85 (2H, m), 3.6 (2H, m), 3.2 (2H, s), 2.7 (2H, m), 2 (2H, m); 1.55 (2H, m); δC (400 MHz; CDCl3): 63.15, 37.83, 20.40.

References:

US2002/72533,2002,A1

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