Reaction conditions: 7a to 7b, PSMS (6, 3 equiv), TBHP (10 equiv),
PhCF3/H2O, rt, 24 h (78%); 7b to 7d, (1) Mg (40 equiv), CD3OD, reflux, 24 h; (2)
SmI2 (6 equiv), THF:D2O (10:1), rt, 30 min,
70% (2 steps), 91% D incorporation; 7b to 7e, (1) NaH (10 equiv), NFSI (5 equiv), DMF, 0 °C to rt, 12 h,
94%; (2) Mg (30 equiv), 8 M HOAc:NaOAc (1:1) buffer solution, DMF,
rt, 8 h, 73%. 7b to 7f, KOtBu,
S8, THF; then MeI (quant.); 7b to 7g, (1) NaH, PhCHO, THF, 50 °C, 36 h; (2) SmI2, rt,
5 min (32%).