Use of the carbopalladation of 1,2-propadiene in a two step synthesis of steroids

Article abstract of DOI:10.1016/S0040-4039(00)92119-1

The palladium-catalyzed reaction of 1,2-propadiene, the enol triflate of an α-tetralone and the enolate of 2-methyl-1,3-cyclopentanedione leads to compounds such as 1a which are transformed under acidic conditions to steroidal trienones. This approach to