Scheme 3. Synthesis of Silyl Enol Ethers 12 and 13.
Reagents and conditions: (a) TESCl, ImH, CH2Cl2, 0 °C, 77%; (b) LDA, THF, −78 °C then TMSCl, 80%; (c) TMSOTf, Et3N, THF, 0 °C, 92%.
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