Scheme 2. Synthesis of 2a-c, e.
Reagents and conditions: (a) BF3·Et2O, Et3SiH, CH2Cl2, 0 °C; (b) BF3·Et2O, allylTMS, CH2Cl2, 0 °C; (c) CyMgCl or AdMgBr; (d) Mitsunobu conditions; (e) H2, Pd/C, EtOH, 1 atm.
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