Rh2(OAc)4-catalyzed reactions of α-diazoimides: a simple and novel synthesis of mono- and bis(2,3-fused perhydrooxazol-4-one) systemsElectronic supplementary information (ESI) available: experimental procedure and spectral data for compounds 2a–p, 3, 5a–f. See http://www.rsc.org/suppdata/cc/b2/b211717g/
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