| abstract |
This invention provides processes for the preparation of compounds having structure (A) characterized in that X and Y are the same or different, and H, OH, OR, SH, SR, NH2, NHRÆ, or NRÆRÆÆ, Z is H, F, Cl , Br, I, CN or NH2. R is hydrogen, halogen, C1-C6 lower alkyl or aralkyl, NO2, NH2, NHRÆ, NRÆRÆÆ, OH, OR, SH, SR, CN, CONH2, CSNH2, CO2H, CO2RÆ, CH2CO2H, CH2CO2RÆ, CH = CHR, CH2CH = CHR, or C = CR. RÆ and RÆÆ are the same or different, and lower C1-C6 alkyl. R13 is hydrogen, alkyl, acyl, phosphate (monophosphate, diphosphate, triphosphate, or stabilized phosphate) or silyl. |