Synlett, Table of Contents Synlett 2021; 32(14): 1457-1460DOI: 10.1055/a-1509-0949 letter Stereoselective Synthesis of Polyfunctionalized Nitrones through Conjugate Addition of α-Halo Hydrazones to Nitroso Compounds Xiao-Fan Bi , Hai-Liang Pang , Zhe Tang , Heng Zhang , Lu-Yu Cai , Hui-Hui Wu , Xiao-Zu Fan , Hong-Wu Zhao∗ Recommend Article Abstract Buy Article All articles of this category Abstract In the presence of Na2CO3, conjugate addition of α-halo hydrazones to nitroso compounds proceeded readily to give polyfunctionalized nitrones in reasonable chemical yields and excellent stereoselectivities. The chemical structure and the stereochemical configuration of the products were unambiguously identified by an X-ray single-crystal structural analysis. Key words Key wordsconjugate addition - halo hydrazones - nitroso compounds - nitrones - stereoselectivity Full Text References References and Notes For selected examples, see: 1a Rao PS, Kurumurthy C, Veeraswamy B, Kumar GS, Poornachandra Y, Kumar CG, Vasamsetti SB, Kotamraju S, Narsaiah B. Eur. J. Med. Chem. 2014; 80: 184 1b Buchlovič M, Kříž Z, Hofr C, Potáček M. Bioorg. Med. Chem. 2013; 21: 1078 1c Sklavounou E, Hay A, Ashraf N, Lamb K, Brown E, MacIntyre A, George WD, Hartley RC, Shiels PG. Biochem. Biophys. Res. Commun. 2006; 347: 420 ; corrigendum: Biochem. Biophys. Res. Commun. 2006, 347, 1206 1d Giner-Sorolla A. J. Med. Chem. 1969; 12: 717 For selected examples, see: 2a Li Z, Zhao J, Sun B, Zhou T, Liu M, Liu S, Zhang M, Zhang Q. J. Am. Chem. Soc. 2017; 139: 11702 2b Ferraz MC, Mano RA, Oliveira DH, Maia DS. V, Silva WP, Savegnago L, Lenardao EJ, Jacob RG. Medicines 2017; 4: 39 2c Nguyen D.-V, Prakash P, Gravel E, Doris E. 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Commun. 1992; 296 10 N-(1Z,2Z)-2-[Oxido(phenyl)imino]-1-phenylethylidene}acetohydrazide (3aa); Typical ProcedureNa2CO3 (2.0 equiv, 0.40 mmol) was added to a solution of α-bromo hydrazone 1a (1.0 equiv, 0.20 mmol) and nitroso compound 2a (1.2 equiv, 0.24 mmol) in dry CH2Cl2 (1.0 mL) under air at rt, and the mixture was stirred for 20 h. When the reaction was complete (TLC), the mixture was concentrated under reduced pressure and the residue was purified by flash column chromatography [silica gel, PE–EtOAc (3:1)] to give a yellow solid; yield: 51.7 mg (92%); mp 133.3–133.8 °C. 1H NMR (400 MHz, CDCl3): δ = 11.05–10.42 (m, 1 H), 8.10 (s, 1 H), 7.83 (s, 2 H), 7.68 (s, 2 H), 7.54 (s, 3 H), 7.41 (s, 3 H), 2.41–2.10 (m, 3 H). 13C NMR (100 MHz, CDCl3): δ = 174.5, 146.8, 138.0, 135.8, 131.5, 131.0, 129.7, 129.5, 128.7, 127.2, 121.9, 20.4. HRMS (ESI): m/z [M + H]+ calcd for C16H16N3O2: 282.12370; found: 282.12405. 11 CCDC 2075055 contains the supplementary crystallographic data for compound 3aa. The data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/structures. Supplementary Material Supplementary Material Supporting Information