Similarly, a radical acceptor with two stabilizing groups was well tolerated using protected dehydroalanine to generate unnatural amino acid 2j. Methacrolein was also successful, providing aldehyde 2k. Substitution at the b-position was less well tolerated, though successful reactions were achieved with cyclopentenone and dimethyl maleate, affording 2l and 2m in 25% and 54% yield respectively. Styrenes were also successful coupling partners (2n-2t). Unactivated, electron-neutral styrene yielded oxetane 2n in 35% yield. Reactivity increased with more electron-poor acceptors whereby p-bromophenyl (73%) and isobenzofuranone (60%) functionalities were incorporated efficiently (2o, 2p). The tolerance of an aryl bromide group is noteworthy, especially since it serves as a synthetic handle for downstream diversifications. Importantly, pyridines, the most prevalent aromatic N-heterocycles in bioactive compounds, could be readily introduced whilst tolerating functionalities such as a secondary amide (2q-2t). Increasing the equivalents of vinyl pyridine acetamide to 3.0 equiv, or using oxetane acid 1 in excess did not improve the yield of 2s.