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Paper | Special issue | Vol 103, No. 1, 2021, pp.425-443
Published online, 28th October, 2020
DOI: 10.3987/COM-20-S(K)29
Stereoselective Alkylation of Oxathiazinane N,O-Ketals for the Construction of Aza-Quaternary Carbon Centers

Hisanori Nambu, Eri Tanaka, Mai Okada, Chiaki Hirosawa, Narumi Noda, Tomoya Fujiwara, and Takayuki Yakura*

*Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan

Abstract

Stereoselective construction of aza-quaternary carbon centers was achieved using the alkylation of oxathiazinane N,O-ketals prepared by Rh(II)-catalyzed C–H amination of sulfamates. The addition of alkyl Grignard reagents into N,O-ketals in the absence of any Lewis acid proceeded stereoselectively to provide the corresponding alkylated products with an aza-quaternary carbon center in high yields. The obtained product could be converted into an α-amino alcohol derivative, which is a potential synthetic intermediate for sphingofungin F and its derivatives.