Skip to main content
. Author manuscript; available in PMC: 2016 Dec 14.
Published in final edited form as: Angew Chem Int Ed Engl. 2015 Dec 22;55(5):1614–1650. doi: 10.1002/anie.201502227

Scheme 17.

Scheme 17

Reaction conditions: (a) 10% aqueous KOH, H2O, DME, 87%; (b) n-Bu3SnH, AIBN, THF, 90%; (c) MCPBA, CH2Cl2, 71%; (d) 10% aqeous H2SO4, 78%; (e) Amberlyst A-27, H2O, 89%.