... Boc group over other types of pro- tection (entries 2, 3, and 8). Further exploration of this chemistry and the ... The organic phase was washed sequentially with 0.5 M H3PO4, brine, 1 M NaHCO,, and brine, dried (MgSOJ ... J = 5.5, 12.0 Hz), 3.67 (dd, 1 H, J = 3.5, 12.0 Hz), 3.87 (br s, 1