Welcome to chemicalbook!
Chinese English Japanese Germany Korea
010-86108875
Try our best to find the right business for you.
Do not miss inquiry messages Please log in to view all inquiry messages.

Welcome back!

ChemicalBook CAS DataBase List (3,4-Dimethoxybicyclo[4.2.0]octa-1,3,5-trien-7-yl)methanamine hydrochloride
35202-55-2

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

8synthesis methods
4,5-Dimethoxy-1-cyanobenzocyclobutane

35202-54-1

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

35202-55-2

General procedure for the synthesis of (3,4-dimethoxybicyclo[4.2.0]octa-1,3,5-dien-7-yl)methanamine hydrochloride from 4,5-dimethoxy-1-cyanobenzocyclobutane: reference to EP 0 534 859 Step 1: Preparation of 3,4-dimethoxybicyclo[4.2.0]octa-1,3,5-trien-7-amine hydrochloride. To a solution of 25 g of 3,4-dimethoxybicyclo[4.2.0]octa-1,3,5-triene-7-carbonitrile dissolved in 250 ml of tetrahydrofuran (THF) at room temperature was added slowly and dropwise 312 ml of borane-THF complex solution with continuous stirring for 12 hours. Subsequently, 200 mL of ethanol was added and stirring was continued for 1 hour. 100 ml of a 3.3 N solution of ethyl ether hydrochloride was added slowly and dropwise. Eventually 27.7 g of the target product was obtained in 90% yield with a melting point of 205°C.

-

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

FullText

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