Cationic palladium complex catalyzed diastereo- and enantioselective tandem annulation of 2-formylarylboronic acids with allenoates.

Cationic palladium complex [(dppp)Pd(H(2)O)(2)](2+)(BF(4)(-))(2) catalyzed tandem annulation reactions of 2-formylarylboronic acids and allenoates produce the indenol derivatives diastereo- and enantioselectively in a highly efficient way.