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. Author manuscript; available in PMC: 2018 Sep 11.
Published in final edited form as: Angew Chem Int Ed Engl. 2017 Aug 9;56(38):11545–11548. doi: 10.1002/anie.201707015

Figure 2.

Figure 2

(a) i. CSA, AcOH/DME, 60 °C, 6 h, ii. MeOH, Et3N, −40 °C → 23 °C, 18 h, 88% yield; (b) i. CSA, AcOH/DME, 60 °C, 6 h, ii. allyl alcohol, Et3N, 0 °C → 23 °C, 18 h, 74% yield; (c) CSA, AcOH/DME, 60 °C, 6 h, ii. pyrrolidine, Et3N, −40 °C → 23 °C, 18 h, 61% yield; (d) i. CSA, AcOH/DME, 60 °C, 6 h, ii. allyl amine, Et3N, 0 °C → 23 °C, 18 h, 63% yield.