Process for the preparation of depogen

Details Process for the preparation of depogen Process for the preparation of depogen

1986-09-26

1989-04-11

Rizzo, Nicolas S.

Organic compounds -- part of the class 532-570 series

Organic compounds

Chalcogen bonded directly to ring carbon of the purine ring...

544267, C07D47308, A61K 3152

Patent

active

048208388

ABSTRACT:
The invention relates to a process for the preparation of a new crystalline monohydrate of 1-(3', 4'-diethoxy-benzyl-6, 7-diethoxy-3,4-dihydro-isoquinolinium-theophylline-7-acetate and if desired of pure 1-(3', 4'-diethoxy-benzyl)-6,7-diethoxy-3, 4-dihydro-isoquinolinium-theophylline-7-acetate free of contaminating oxidation products which comprises reacting 1-(3',4'-diethoxy-benzyl)-6,7-diethoxy-3,4-dihydro-isoquinolinium with theophylline-7-acetate acid in the presence of water and one or more organic solvent(s) and if desired dehydrating the 1-(3',4'-diethoxy-benzyl) 6,7-diethoxy-3,4-dihydro-isoquinolinium-theophyl line-7-acetate-monohydrate thus obtained.

REFERENCES:
patent: 4035366 (1977-07-01), Szentmiklosi et al.

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