(3,4-Dimethoxybicyclo[4.2.0]octa-1,3,5-trien-7-yl)methanamine hydrochloride synthesis

Yield:35202-55-2 90%

Reaction Conditions:

Stage #1:3,4-dimethoxy-bicyclo[4.2.0]octa-1,3,5-triene-7-carbonitrile with borane-THF in tetrahydrofuran at 20; for 12 h;
Stage #2: with ethanol in tetrahydrofuran for 1 h;
Stage #3: with hydrogenchloride in tetrahydrofuran;diethyl ether

Steps:

3.1 Step 1: 3,4-dimethoxybicyclo[4.2.0]octa-1,3,5-trien-7-amine hydrochloride
Based on EP 0 534 859 Step 1: 3,4-dimethoxybicyclo[4.2.0]octa-1,3,5-trien-7-amine hydrochloride [0053] 312 mL of a molar solution of borane complexed with THF are added dropwise, and whilst stirring at ambient temperature, to a solution of 25 g of 3,4-dimethoxybicyclo[4.2.0]octa-1,3,5-triene-7-carbonitrile in 250 mL of THF and left in contact for 12 hours; 200 mL of ethanol are then added and stirring is carried out for 1 hour. 100 mL of 3.3N ethereal HCl are added dropwise. 27.7 g of the expected product are obtained. [0054] Yield=90% [0055] m.p.=205° C.

References:

LES LABORATOIRES SERVIER;CARRANZA, Maria Del Pilar;GARCIA ARANDA, Maria Isabel;GONZALEZ, José Lorenzo;SANCHEZ, Frédéric US2014/107334, 2014, A1 Location in patent:Paragraph 0052-0055

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