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. 2019 Jun 6;58(28):9522–9526. doi: 10.1002/anie.201905003

Scheme 1.

Scheme 1

a) 6 steps, Scheme S1;3 b) S2Cl2, 0 °C to rt, 24 h, 20 %;3 c) FL–NH2, DMF, rt, 12 h, 14 %; d) 6 steps, Scheme S5;11 e) 1. NH3, MeOH, rt, 30 min, 2. S2Cl2, CH2Cl2, 0 °C to rt, 2 h, 58 %; f) 3 steps; g) 10 steps, Scheme S6. PNP=p‐nitrophenyl.