Fig. 13.
Reagents: a DAST, CH2Cl2; b NHC, DMF/THF; c 1. KCN, MeOH. 2. IBX, EtOAc, 80 °C; d 1. LiCl, H2O, DMSO, 170 °C; e NaOMe, MeOH, 50 °C; f 1. MeMgI, Et2O, 160 °C. 2. ZnBr2, MgSO4, CH2Cl2 and g 1. ZnCl2, HCl, CH2Cl2. 2. KOC5H11, toluene
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