Solid-phase synthesis of α-alkylserines via phase-transfer catalytic alkylation of polymer-supported 2-phenyl-2-oxazoline-4-carboxylate

Described is the development of a new solid-phase synthetic method for α-alkylserines in which phase-transfer catalytic alkylation of polymer-supported 2-phenyl-2-oxazoline-4-carboxylate (12) is the key step. The easy preparation of the polymer-supported substrate 12, the high chemical yield (up to 93%), and the mild cleavage conditions could make this method very practical for the synthesis of α-alkylserines.