Triethyl orthoacetate (also known as 1,1,1-Triethoxyethane, Orthoacetic acid triethyl ester) is typically used as pharmaceutial and water scavenger, and also employed in organic synthesis to introduce the acetate group into an alcohol. for example, it is used as a starting material in the synthesis of Finerenone (BAY 94-8862) is a third-generation, selective, and orally available nonsteroidal mineralocorticoid receptor (MR) antagonist.
Efficient esterification of carboxylic acids and phosphonic acids with trialkyl orthoacetate in ionic liquid. 
Discovery of BAY 94-8862: a nonsteroidal antagonist of the mineralocorticoid receptor for the treatment of cardiorenal diseases. 
Finerenone Impedes Aldosterone-dependent Nuclear Import of the Mineralocorticoid Receptor and Prevents Genomic Recruitment of Steroid Receptor Coactivator-1.
Annulated 3-Amino-4-Imino-Pyrimidines: Their Utility as Useful Precursors for the Synthesis of Fused Heterocycles.
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 L.Amezit, et al, J. Biol. Chem., 2015, 290(36), pp 21876-21889.