Synthesis of adenosylcobinamide 2-chlorophenyl phosphate, a zwitterionic cobinamide phosphate analog of adenosylcobalamin en route to crystallizable cobinamides.
J Inorg Biochem
; 91(2): 371-87, 2002 Aug 15.
Article
em En
| MEDLINE
| ID: mdl-12161307
ABSTRACT
The design and implementation of a new, higher yield synthetic method for synthesizing zwitterionic cobinamide phosphates is described. Adenosylcobinamide 2-chlorophenyl phosphate, beta-AdoCbi-PAr -- a 5,6-dimethylbenzimidazole-free adenosylcobalamin analog, where a 2-chlorophenyl group replaces the ribofuranose and 5,6-dimethylbenzimidazole moieties -- is prepared in tens of milligram quantities, quantities sufficient for crystallization and enzyme trials, amounts 100-fold greater than previously available. The use of (31)P NMR spectroscopy to follow reactions directly, the use of control reactions to learn how to reduce reactant water content, and the use of reaction solvents that completely dissolved the corrinoid reactants were crucial for developing this new synthetic route. beta-AdoCbi-PAr was synthesized in 10% overall isolated yield from cyanocobinamide. Cyanocobinamide was converted to cyanocobinamide 2-chlorophenyl phosphate by direct phosphorylation with 2-chlorophenyl phosphodi-(1,2,4-triazolide) in 25% isolated yield and > or = 98% purity. Sodium borohydride reduction of cyanocobinamide 2-chlorophenyl phosphate and reaction with 5'-chloro-5'-deoxy-adenosine produced beta-AdoCbi-PAr in 42% yield and > or = 98% purity. These compounds were characterized by HPLC, (1)H and (31)P NMR, UV-visible spectroscopy, and liquid secondary ionization mass spectroscopy.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Cobamidas
/
Amidas
Idioma:
En
Revista:
J Inorg Biochem
Ano de publicação:
2002
Tipo de documento:
Article
País de afiliação:
Estados Unidos