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. Author manuscript; available in PMC: 2011 Jul 21.
Published in final edited form as: Angew Chem Int Ed Engl. 2011 Apr 21;50(22):5178–5181. doi: 10.1002/anie.201007757

Scheme 4.

Scheme 4

Completion of the left-hand fragment. Reagents and conditions: a) hv, NMQPF6, O2, Na2S2O3, NaOAc, DCE, PhMe, 45% yield of isolated product (75% based on recovered starting material); b) mCPBA, Sc(OTf)3, CH2Cl2, 68%; c) IBX, DMSO, 93%. IBX = 2-iodoxybenzoic acid, mCPBA=meta-chloroperoxybenzoic acid, Tf =tri-fluoromethanesulfonyl.