New water soluble Pd-imidate complexes as highly efficient catalysts for the synthesis of C5-arylated pyrimidine nucleosides†
Abstract
The direct reactions between the precursors trans-[Pd(imidate)2(SMe2)2] and 1,3,5-triaza-7-phosphaadamantane (PTA) yield new water-soluble palladium(II) complexes trans-[Pd(imidate)2(PTA)2](imidate = succinimidate (suc) 1, maleimidate (mal) 2, phthalimidate (phthal) 3 or saccharinate (sacc) 4. The new complexes were revealed as excellent catalysts for environmentally friendly, efficient Suzuki–Miyaura cross-coupling of synthetically challenging substrates like the antiviral nucleoside analogue 5-iodo-2′-deoxyuridine in water as solvent.