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. 2016 Mar 1;22(16):5657–5664. doi: 10.1002/chem.201505093

Scheme 10.

Scheme 10

Reagents and conditions: a) Dess–Martin reagent, CH2Cl2; b) but‐3‐en‐1‐ylmagnesium bromide, THF; c) trimethylsilyl trifluoromethanesulfonate (TBSOTf), diisopropylethylamine (DIPEA), CH2Cl2; d) Grubbs II (10 mol %), CH2Cl2, heating to reflux; e) HCl, EtOH, Et2O.