“…8,11.5,9.8 Hz,1H), 2.38 (ddd, J ) 17.8, 10.3, 2.0 Hz, 1H), 2.16 (m, 1H), 1.98 (m, 1H), 1.52 (s, 9H), 1.30 (s, 3H), 1.26 (s, 3H), 0.85 (s, 9H), 0.12 (s, 3H), 0.10 (s, 3H); 13 C NMR (75 MHz, CDCl3) δ 174. 4,149.8,109.8,82.3,75.2,71.1,68.6,60.2,31.8,29.4,28.0 (3 C),26.2,25.4 (3 C),24.9,17.6,58.71;H,9.15;N,3.26. Found: C,58.79;H,9.20;N,3.12. Lactam 51.…”