tert-Butyl dimethylphosphonoacetate

tert-Butyl dimethylphosphonoacetate is a phosphonate reagent used to construct carbon–carbon double bonds and introduce a protected carboxyl-containing fragment. In Horner–Wadsworth–Emmons olefination, its activated methylene group reacts with carbonyl compounds to produce alpha,beta-unsaturated tert-butyl esters, commonly favoring the E isomer. The tert-butyl group protects the acid functionality during subsequent transformations.

The material combines the phosphonate reaction handle with an acid-removable ester, giving a different downstream deprotection option from methyl or ethyl phosphonoacetates. Its unsaturated products can participate in conjugate addition and ring-forming sequences before conversion to the corresponding acids. This makes the reagent useful where double-bond installation and temporary carboxyl protection are required within the same synthetic fragment.

Typical Applications

• Unsaturated ester and acid synthesis: Used to olefinate aldehydes or suitable ketones, introducing a tert-butyl ester-bearing alkene. Subsequent ester cleavage provides access to the corresponding unsaturated carboxylic-acid intermediate.
• Oxygen-heterocycle construction: Used to prepare alpha,beta-unsaturated ester substrates for oxa-Michael addition, where the newly introduced alkene serves as the acceptor in subsequent carbon–oxygen bond formation.
• Complex antibacterial intermediate synthesis: Used in reported routes to myxopyronin analogues to build ester-containing unsaturated fragments that are elaborated into more complex structures during multistep synthesis.

Specifications

Specifications describe the standard grade. Tolerance, test method and documentation package are confirmed per order.