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. Author manuscript; available in PMC: 2018 Sep 26.
Published in final edited form as: Org Biomol Chem. 2017 Sep 26;15(37):7770–7782. doi: 10.1039/c7ob01448a

Scheme 3. Synthesis of the cPT 38, with no free amine group.

Scheme 3

The cyclization linker a19 (shown in blue) was synthesized using FmOH (a17) and succinic anhydride (a18)43 and was incorporated in the cPT synthesis.