Preparation of a Highly Functionalized Allylsilane for Use in Three‐ Bond Cascade Reactions.

Preparation of the novel allylsilane, methyl 3-formyl-4-(phenyldimethylsilylmethyl)pent-4-enoate (2) was accomplished in 7 steps from 2,3-dibromopropene. (2) has great potential as an annulating reagent.