“…32 The reaction vessel was protected from light during the course of deprotection, after which the resin was washed with CH 2 Cl 2 (5 × 5 mL), DMF (5 × 5 mL), 0.5% DIPEA + 0.5% diethyldithiocarbamic acid sodium salt in DMF (5 × 5 mL), DMF (5 × 5 mL), and CH 2 Cl 2 (5 × 5 mL). On-Resin Cyclization : a solution of PyBOP (280 mg, 0.6 mmol), HOBt (81 mg, 0.6 mmol) and DIPEA (0.1 mL, 0.6 mmol) in CH 2 Cl 2 /DMF (1:1, 10 mL) was added to the resin and the mixture shaken for 3 h. The resin was washed with CH 2 Cl 2 (5 × 5 mL), DMF (5 × 5 mL), and CH 2 Cl 2 (5 × 5 mL).…”