Scheme 5.

Further Transformations^a

^aReaction conditions: (a) (i) DPPA, Et₃N, PhMe, 110 °C, 2 h; (ii) 3 M HCl, AcOH, 0 °C to rt, 16 h. (b) NHPI, DCC, 10 mol % DMAP, CH₂Cl₂, rt, 12 h. (c) 4-Methylquinoline, TFA, 20 mol % NaI, 30 mol % PPh₃, acetone, rt, 16 h, blue LED. (d) (Bcat)₂, DMAc, rt, 16 h, blue LED, then pinacol, Et₃N. (e) NaBO₃·4H₂O, THF/H₂O, rt, 3 h.