Synthesis of the Lipophilic Antifolate Piritrexim via a Palladium(0)-Catalyzed Cross-Coupling Reaction
作者:David C. M. Chan、Andre Rosowsky
DOI:10.1021/jo040268z
日期:2005.2.1
A regiospecific and convergent route the lipophilic antifolate piritrexim (PTX) is described in which a key step is a Pd(0)-catalyzedcross-coupling reaction between 2-amino-3-cyano-4-methyl-5-bromopyridine and 2,5-dimethoxybenzylzinc chloride to form 2-amino-4-methyl-5-(2,5-dimethoxybenzyl)nicotinonitrile. To complete the synthesis, the amino group is replaced by a more reactive bromine atom via nonaqueous