Reaction Steps
Condensation of 21 with 4-cyanobenzoic acid on a 0.10 mmol scale via General Procedure F furnished 24 (63 mg, 89%): δH (400 MHz, CDCl3) 1.59-1.72 (m, 4H, CH2), 1.83-1.94 (m, 2H, CH2), 2.39 (s, 3H, CH3), 2.79-3.21 (m, 8H, CH3, CH and CH2), 3.65 (s, 2H, CH2), 4.77 (s, 2H, CH2), 4.95 (s, 2H, CH2), 4.97 (s, 2H, CH2), 5.34 (s, 2H, CH2), 6.60 (t, J=8.4 Hz, 1H, CH), 6.69 (dd, J=8.0 and 1.6 Hz, 1H, CH), 7.03-7.12 (m, 4H, 4 CH (Ar)), 7.21-7.82 (m, 12H, 12 CH (Ar)); δC (100 MHz, CDCl3) 21.4, 29.5, 35.9, 42.0, 48.1, 51.3, 52.7, 66.9, 70.6, 113.3, 113.9, 119.9, 120.7, 126.7, 126.9, 127.3, 127.4, 127.9, 128.1 (2), 128.4, 128.5, 129.0, 129.4, 132.3, 132.9, 134.8, 135.0, 135.5, 135.6, 140.0, 143.3, 144.0, 144.8, 158.6, 165.2, 167.0, 168.3; LRMS (ES+) calcd for [C51H48N4O7S+H] 861.33 found 861.38.
