Preparation of Enantiomerically Pure Perfluorobutanesulfinamide and Its Application to the Asymmetric Synthesis of α‑Amino Acids
A high yielding and practical two-step synthesis of enantiomerically pure perfluorobutanesulfinamide from Senanayake’s 2-aminoindanol-derived sulfinyl transfer reagent was developed and carried out on a multigram scale. Straightforward condensation of this sulfinamide with ethyl glyoxylate provided...
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Veröffentlicht in: | Journal of organic chemistry 2016-02, Vol.81 (4), p.1547-1557 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A high yielding and practical two-step synthesis of enantiomerically pure perfluorobutanesulfinamide from Senanayake’s 2-aminoindanol-derived sulfinyl transfer reagent was developed and carried out on a multigram scale. Straightforward condensation of this sulfinamide with ethyl glyoxylate provided the N-perfluorobutanesulfinyl imino ester. The utility of this activated N-sulfinyl imino ester was demonstrated for reactions that gave either no product or very low yields with the corresponding less electrophilic N-tert-butanesulfinyl derivative. Specifically, the Rh(III)-catalyzed C–H bond addition of aromatic compounds to the N-perfluorobutanesulfinyl imino ester provided arylglycines with very high diastereoselectivities for a range of directing groups including pyrrolidine amide, azo, sulfoximine, 1-pyrazole, and 1,2,3-triazole functionalities. Thermal asymmetric aza-Diels–Alder reactions also proceeded in good yields and with high selectivity, including for the substituted dienes (E)-1,3-pentadiene and (2E,4E)-2,4-hexadiene. |
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ISSN: | 0022-3263 1520-6904 1520-6904 |
DOI: | 10.1021/acs.joc.5b02700 |