“…Conjugate additions of organocuprates to R,βunsaturated N-acyloxazolidinones 116 proceed with good diastereoselectivity and allow access to β-branched carboxylic acids (Scheme 116), 26 or β-substituted GABA analogs. 519 In addition to copper-based reagents, 26,436,520 aluminum can also be used to deliver a nucleophile in a 1,4-manner. 475,521 The carbon-carbon bond formation was further extended to prepare allylated products by the conjugate addition of allyltrimethylsilane to R,β-unsaturated N-acyloxazolidinone 116 (Scheme 117).…”