Asymmetric Synthesis of Aziridines by Reduction of N-tert-Butanesulfinyl α-Chloro Imines
Bram Denolf, Erika Leemans and Norbert De Kimpe*
*Department of Organic Chemistry, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium, Email: norbert.dekimpeugent.be
B. Denolf, E. Leemans, N. De Kimpe, J. Org. Chem., 2007, 72, 3211-3217.
DOI: 10.1021/jo0624795 (free Supporting Information)
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Reduction of (RS)-N-tert-butanesulfinyl α-halo imines with NaBH4 in THF, in the presence of 10 equiv of MeOH, and subsequent cyclization with KOH afforded the corresponding (RS,S)-N-(tert-butylsulfinyl)aziridines in quantitative yields. On the contrary, its epimer, (RS,R)-N-(tert-butylsulfinyl)aziridine was synthesized in good yields and diastereoselectivity by switchover of the reducing agent from NaBH4 to LiBHEt3.
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