[reaction: see text] The condensation between a functionalized allylstannane and alpha-alkoxyaldehydes allows rapid access to complex and selectively protected trihydroxylated synthons. The stereocontrol of this process is strongly dependent upon the nature and the amount of the Lewis acid employed.
Leroy, B., & Marko, I. (2002). Rapid and versatile synthesis of functionalized polyhydroxylated fragments. Organic Letters, 4(1), 47-50. https://doi.org/10.1021/ol016863u (Original work published 2002)