for the following products
6-Amino-2-N-Boc-1,2,3,4-tetrahydro-isoquinoline | tert-Butyl 6-amino-1,2,3,4-tetrahydroisoquinoline-2-carboxylate | tert-Butyl 6-amino-3,4-dihydro-1H-isoquinoline-2-carboxylate and 6-Amino-3,4-dihydro- 2(1H)-isoquinolinecarboxylic acid 1,1-dimethylethyl ester
