Formation of Seven‐Membered Carbocycles by the Use of Cyclopropyl Silyl Ethers as Homoenols

Straightforward ring-closure: An expedient entry to seven-membered carbocycles is achieved by the Kulinkovich cyclopropanation of acetal-tethered esters and the subsequent addition of the resulting cyclopropyl silyl ethers to the oxocarbenium ion intermediates. Of particular note is the effective use of a tert-butylsilylene group for diastereoselective cyclization.