No wonder the Cbz group decomposed, I misread my calculations as 0.48 mL rather than 0.048 mL and heated with 10-fold the amount of methanesulfonic acid overnight.

No wonder the Cbz group decomposed, I misread my calculations as 0.48 mL rather than 0.048 mL and heated with 10-fold the amount of methanesulfonic acid overnight.