The combination of an iridium(III) metallacycle and 1,3,5‐trimethoxybenzene catalyses rapidly and selectively the reduction of esters to aldehydes at room temperature with high yields throughhydrosilylation followed by hydrolysis. The esterreduction involves the trapping of transient silyl cations by the 1,3,5‐trimethoxybenzene co‐catalyst, supposedly by formation of an arenium intermediate whose
Access to Wieland–Miescher Diketone-Derived Building Blocks by Stereoselective Construction of the C-9 Quaternary Carbon Center Using the Mukaiyama Aldol Reaction
The Mukaiyama aldol reaction has been used to efficiently install a lateral chain at the C-9 position of the Wieland–Miescher ketone derivative 3 within two steps, representing a shortcut compared to that of the classical sequences. The treatment of the silylated enol ether 8 with a wide range of acetals in the presence of tin tetrachloride led to a the diastereoselective construction of the C-9 quaternary