反应详情

General procedure D was used to deprotect 1.4 mmols of 41 using 14 mL of dichloromethane and trifluoroacetic acid. After previously described recrystallization techniques, the TFA salt of 41 was coupled to 0.4 grams (1.4 mmols) of 4-dodecylbenzoic acid using 0.73 grams (1.4 mmols) of PyBOP and 0.72 grams (5.6 mmols) of N,N-diisopropylethylamine in 14 mL of dichloromethane according to general procedure E. Using previously described work-up and purification techniques (column chromatography, 25% EtOAc in hexanes), yielded 0.2 grams (0.55 mmols, 39%) of the title product as an off-white solid. 1H and 13C NMR data were identical to that of 29.

1. customAfter previously described recrystallization techniques
2. customwork-up and purification techniques (column chromatography, 25% EtOAc in hexanes)