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. 2015 Aug 13;21(41):14376–14381. doi: 10.1002/chem.201502397

Scheme 3.

Scheme 3

i) Attempted reaction of triazinylalanine methyl ester 12 with norbornene derivatives 15 and 16 led to no observable product formation. ii) Synthesis of benzoylated bicyclononyne 19 from single diastereoisomer of bicyclononene 17. iii) Reaction of protected Fmoc-TrzAla-Ome 12 with protected bicyclononylyl benzoate 19 gave a mixture of diastereoisomers 20 a and b at 37 °C.