1.1: N-ethyl-N,N-diisopropylamine; HATU / N,N-dimethyl-formamide / 0.25 h / 20 °C 1.2: 60 °C 2.1: hydrogen / palladium on activated charcoal / methanol / 4 h View Scheme
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Patent: US2013/79341 A1, 2013 ;