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. Author manuscript; available in PMC: 2021 Sep 22.
Published in final edited form as: Org Biomol Chem. 2020 Apr 8;18(14):2739–2746. doi: 10.1039/d0ob00223b

Scheme 3.

Scheme 3

Reagents and conditions; Method 4: (i) (a) 7, anhyd. CH2Cl2, 4 Å powdered MS, rt, 40 min; (b) DDQ, rt, 3 h; (ii) (a) Ph2SO, DTBMP, 4 Å powdered MS, anhydrous ClCH2CH2Cl, 40 min; (b) Tf2O, −35 °C, 15 min; (c) −35 °C to rt, o/n, 45%.