In this talk, I will discuss recent progress in the use of T- and U-dualities to generate higher-derivative solutions. In particular, I will show how to use an O(2,1) boost to obtain the four-derivative corrections to the four-dimensional Kerr-Sen solution in heterotic supergravity for two choices of four-derivative action, one of which corresponds to the usual Bergshoeff-de Roo action. In the process, we will see that there is a consistent truncation that can be used to restore the heterotic gauge fields. I will then use a simple group theory argument to show the failure of U-duality for solution generation at the four-derivative level in the case of the G_{2(2)} coset model obtained from minimal five-dimensional supergravity.