Abstract
Condensation of 3'-deoxy-3-deazaadenosine, 3'-deoxy-7-deazaadenosine and 3'-deoxyadenosine with N,N'-bis-trifluoroacetyl-L-homocystine dimethyl ester and subsequent deprotection of the resulting N-trifluoroacetyl-S-3'-deoxyadenosyl-L-homocysteine analogues afforded S-3'-deoxy-3-deazaadenosyl-L-homocysteine, S-3'-deoxy-7-deazaadenosyl-L-homocysteine and S-3'-deoxyadenosyl-L-homocysteine respectively. 3'-Deoxy-3-deazaadenosine and 3'-deoxy-7-deazaadenosine were prepared by transformation of the corresponding ribonucleosides with 2-acetoxyisobutyryl bromide. 3'-Deoxy-7-deazaadenosine and 3'-deoxyadenosine were also converted into their 5'-chloro-3',5'-dideoxy derivatives which in turn were condensed with L-homocysteine sodium salt to give S-3'-deoxy-7-deazaadenosyl-L-homocysteine and S-3'-deoxyadenosyl-L-homocysteine which were identical with those synthesized by condensation of the protected L-homocystine with the 3'-deoxynucleosides.
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