The vitamin-B-12 derivative 11, incorporating a peripheral N-4-acetylcytosine moiety, was alkylated under, guanine reductive conditions with 2-(iodomethyl)-2-methylmonothiomalonate 8 bearing the complementary moiety. The reaction yielded a mixture of vitamin-B-12-derived complexes with variations in the cytosine moiety: products 16-18 with a cytosine, a N-4-acetylated cytosine and a N-4-acetylated reduced cytosine moiety were formed (see Scheme 5). The complexes were photolyzed in CHCl3/MeCN to yield the dimethylmalonate derivative 22 (Scheme 6) but not the rearranged succinate, in contrast to the results obtained earlier with complexes incorporating the A(.)T base pair (see Scheme 1).
The vitamin-B-12 derivative 11, incorporating a peripheral N-4-acetylcytosine moiety, was alkylated under, guanine reductive conditions with 2-(iodomethyl)-2-methylmonothiomalonate 8 bearing the complementary moiety. The reaction yielded a mixture of vitamin-B-12-derived complexes with variations in the cytosine moiety: products 16-18 with a cytosine, a N-4-acetylated cytosine and a N-4-acetylated reduced cytosine moiety were formed (see Scheme 5). The complexes were photolyzed in CHCl3/MeCN to yield the dimethylmalonate derivative 22 (Scheme 6) but not the rearranged succinate, in contrast to the results obtained earlier with complexes incorporating the A(.)T base pair (see Scheme 1).
The vitamin-B-12 derivative 11, incorporating a peripheral N-4-acetylcytosine moiety, was alkylated under, guanine reductive conditions with 2-(iodomethyl)-2-methylmonothiomalonate 8 bearing the complementary moiety. The reaction yielded a mixture of vitamin-B-12-derived complexes with variations in the cytosine moiety: products 16-18 with a cytosine, a N-4-acetylated cytosine and a N-4-acetylated reduced cytosine moiety were formed (see Scheme 5). The complexes were photolyzed in CHCl3/MeCN to yield the dimethylmalonate derivative 22 (Scheme 6) but not the rearranged succinate, in contrast to the results obtained earlier with complexes incorporating the A(.)T base pair (see Scheme 1).