Junkers did it in 1932 with the Jumo:
Junkers Jumo 205 - Wikipedia, the free encyclopedia
867Hp at 2,800 rpm for 595 Kilos weight 2 stroke diesel
I have heard said, that but for the advance in fuel technologies with high octane allowing higher compression ratios and supercharging of petrol engines that happened in the 1930s, that we would all be flying diesels like this now. This engine was up with the best in its day.
The Science Museum have an example - ask them why it is not on display!
Jumo 205
Jumo 205 cutawayType
Diesel aero-engineManufacturer
JunkersFirst run1930sMajor applications*
Junkers Ju 86Developed from
Junkers Jumo 204