Nucleic acid related compounds. 76. Synthesis of 5'(E and Z)-chloro-4',5'-didehydro-5'-deoxyadenosines via chlorination and thermolysis of adenosine 5'-sulfoxides. Mechanism-based inhibition of S-adenosyl-L-homocysteine hydrolase
摘要:
Treatment of 2',3'-di-O-acetyl-5'-S-(4-methoxyphenyl)-5'-thioadenosine (1a), or its sulfoxides 2a(S(R)) and 3a(S(S)), with iodobenzene dichloride and potassium carbonate in acetonitrile resulted in formation of the 5'-chloro(and 5',5'-dichloro)-5'-deoxy-5'-[(4-methoxyphenyl)sulfinyl]adenosines 4a, 5a, 6a, and minor diastereomers. Deprotection of 5a gave 5'(S)-chloro-5'-deoxy-5'-[(4-methoxyphenyl)-sulfinyl(S(S))]adenosine [5b(5'S,S(S))] whose stereochemistry and conformation were established by X-ray crystallography. The alpha-chlorination of sulfoxides 2a(S(R)) and 3a (S(S)) occurred with predominant retention of configuration at sulfur. Thermolysis of the alpha-chloro sulfoxides and deprotection gave the chloromethylene derivatives. The 5'(Z)-chloro-4',5'-didehydro-5'-deoxyadenosine [9b(5'Z)] diastereomer was found to be a potent time-dependent inhibitor of S-adenosyl-L-homocysteine hydrolase.
Nucleic acid related compounds. 76. Synthesis of 5'(E and Z)-chloro-4',5'-didehydro-5'-deoxyadenosines via chlorination and thermolysis of adenosine 5'-sulfoxides. Mechanism-based inhibition of S-adenosyl-L-homocysteine hydrolase
作者:Stanislaw F. Wnuk、N. Kent Dalley、Morris J. Robins
DOI:10.1021/jo00053a022
日期:1993.1
Treatment of 2',3'-di-O-acetyl-5'-S-(4-methoxyphenyl)-5'-thioadenosine (1a), or its sulfoxides 2a(S(R)) and 3a(S(S)), with iodobenzene dichloride and potassium carbonate in acetonitrile resulted in formation of the 5'-chloro(and 5',5'-dichloro)-5'-deoxy-5'-[(4-methoxyphenyl)sulfinyl]adenosines 4a, 5a, 6a, and minor diastereomers. Deprotection of 5a gave 5'(S)-chloro-5'-deoxy-5'-[(4-methoxyphenyl)-sulfinyl(S(S))]adenosine [5b(5'S,S(S))] whose stereochemistry and conformation were established by X-ray crystallography. The alpha-chlorination of sulfoxides 2a(S(R)) and 3a (S(S)) occurred with predominant retention of configuration at sulfur. Thermolysis of the alpha-chloro sulfoxides and deprotection gave the chloromethylene derivatives. The 5'(Z)-chloro-4',5'-didehydro-5'-deoxyadenosine [9b(5'Z)] diastereomer was found to be a potent time-dependent inhibitor of S-adenosyl-L-homocysteine hydrolase.