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a) TFA, dichloroethane, MWI: 120 °C, 140 s (13 a,b: 92 and 87 %, respectively); b) 14 a or 14 b, LiHMDS, THF, −35 °C, 1 h (15 a–d: 74, 82, 83 and 75 %, respectively); c) For 16 a,c: 0.1 M aq LiOH, THF/MeOH (4:1) 1.5 h; ii) AcOH (16 a,c: 86 and 82 %, respectively), For 16 b,d: i) LiBr, TEA, MeCN (+2 v/v % H2O), RT, 3 h; ii) AcOH (16 b,d: 91 and 81 %, respectively).
