Scheme 9. Synthesis of Fluorescent Labeled Compound 74a.
aReagents and conditions: (a) (1) HATU, DIEA, DMF; (2) TFA, DCM; (b) (1) HATU, DIEA, DMF; (2) TMSI, BSTFA, DCM.
aReagents and conditions: (a) (1) HATU, DIEA, DMF; (2) TFA, DCM; (b) (1) HATU, DIEA, DMF; (2) TMSI, BSTFA, DCM.