A new model for the coenzyme B12 catalysed methylmalonyl–succinly rearrangement incorporating peripheral A–T base pairing
Abstract
A novel B12 derivative 4 containing a peripheral thymine group is alkylated under reductive conditions with 2-bromo- methyl-2-methylmonothiomalonate 8 bearing the complementary adenine; photolysis in chloroform–acetonitrile gives the rearranged succinate 12 and dimethylmalonate 13 (2 : 1), whereas in MeOH–H2O only the dimethylmalonate 13 is formed.