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An efficient catalytic system comprising of Pd 2 dba 3 /P(t-Bu) 3 H.BF 4 /Cy 2 NMe –for the Heck coupling in the synthesis of 3-alkenyl isochromen-1-ones,  3  has been developed. Air stable alkyl phosphonium salt, [(t-Bu) 3 Ph]BF 4  was found to be vital for the activation of 3- chloroisochromen-1-ones,  1  in regio-selective Heck coupling reactions. The technique has additionally been reached out to typharin, penicilisorin and artemidin analogs.

Pd 2 dba 3 /P(t-Bu) 3 H.BF 4 /Cy 2 NMe Catalyzed Heck Coupling in Synthesis of 3-Alkenyl- 1H -Isochromen-1-Ones