Johnson - Claisen Orthoester Rearrangement:
See: Johnson, W. S., et al., J. Am. Chem. Soc. 1970, 92, 741.
This reaction is discussed in Jie Jack Li, "Name Reactions", Springer:New York, 2014, page 150.
See also: Evans, P. A. (Editor), "Science of Synthesis. Setereoselective Synthesis", Volume 3, 2011, Thieme:New York, pp 366-368.