Using the established procedure, we next explored the substrate scope (Scheme 2). tert-Butyl and benzyl carbamates gave clean conversions with little influence on the faradaic efficiency. Fmoc-protection was not tolerated and decomposition of the substrate with formation of 9-methylidene-9H-fluorene was observed. We speculate that in situ formed methoxide ions might effect base-induced deprotection. The sterically demanding tert-butyl ester (2c) showed a minor decrease in faradaic efficiency and the yield dropped from 98% to 68% compared to the methyl ester (2b). While alanine and phenylalanine derivatives showed good faradaic efficiencies, leucine (1h), asparagine (1i) and glutamine (1j) carbamates showed a lowered faradaic efficiency of <25%.