Synthesis of Tricyclic Isoquinoline Derivatives via Palladium‐ Catalyzed Tandem Reactions of 2,7‐Alkadiynylic Carbonates with 2,3‐Allenyl Sulfamides

The palladium‐catalyzed tandem reactions of 2,7‐alkadiynylic carbonates with 2,3‐allenyl sulfamides for the syntheses of fused tricycles such as 1,3,6,7,8,9‐hexahydrofuro[3,4‐h]isoquinoline, 2,3,6,7,8,9‐hexahydro‐1H‐pyrrolo[3,4‐h]isoquinoline, and 2,3,4,7,8,9‐hexahydro‐1H‐cyclopenta[h]isoquinoline derivatives have been developed. A mechanism has been proposed based on the isolation of a by‐product.