(pyridines, pyrimidines, pyrazines, pyridazines, triazines, benzothiazoles, benzoxazoles, pyrazoles, benzindazoles, quinazolines, etc.) undergo smooth Pd-catalyzedcross-coupling reactions with functionalized aryl-, heteroaryl-, benzylic-, and alkylzinc reagents using Pd(OAc)2/S-Phos as the catalytic system mostly at 25 °C. No copper salt is required to perform these reactions.
4,5-Dihydrobenzo[g]indazoles were efficiently metallated using hindered Mg- and Zn-TMP amides. Trapping of the resulting organometallic reagents with various electrophiles furnished novel C3-substituted 4,5-dihydrobenzo[g]indazoles.