Highly enantioselective construction of the key azetidin-2-ones for the synthesis of carbapenem antibiotics via intramolecular C-H insertion reactions of α-methoxycarbonyl-α-diazoacetamides catalysed by chiral dirhodium(II) carboxylates
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Anada, M
[1
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Watanabe, N
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Hokkaido Univ, Grad Sch Pharmaceut Sci, Sapporo, Hokkaido 0600812, JapanHokkaido Univ, Grad Sch Pharmaceut Sci, Sapporo, Hokkaido 0600812, Japan
Watanabe, N
[1
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Hashimoto, S
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Hokkaido Univ, Grad Sch Pharmaceut Sci, Sapporo, Hokkaido 0600812, JapanHokkaido Univ, Grad Sch Pharmaceut Sci, Sapporo, Hokkaido 0600812, Japan
Hashimoto, S
[1
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[1] Hokkaido Univ, Grad Sch Pharmaceut Sci, Sapporo, Hokkaido 0600812, Japan
A highly enantioselective construction of 3-oxa-1-azabicyclo[4,2,0]octanes (up to 96% ee) has been achieved by intramolecular C-H insertion of alpha-methoxycarbonyl-alpha-diazoacetamides catalysed by dirhodium(II) complexes incorporating N-phthaloyl-(S)-amino acids as chiral bridging ligands, which provides a new, catalytic asymmetric route to key intermediates for carbapenem antibiotics.