Scheme 5.
Synthesis of compound 12. a) EDCI*HCl, HOBt, NEt3, DCM, r.t., 18 h, 76 %; b) TFA, Et3SiH, DCM, r.t., 18 h, 81 %. EDCI=1‐Ethyl‐3‐(3‐dimethylaminopropyl)carbodiimide, TFA=trifluoroacetic acid.
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