Tsc-protected ε-amino acids, bicyclo[3.3.0]octane-5-amino-1-carboxylic acids (1), ready to use in the solid-phase synthesis, are prepared from 4,4-diethylcarboxylic bicyclo[3.3.0]oct-2-enone (3), which is available in bulk from 2 through the catalytic Pauson-Khand reaction. ... Tsc-protected ε-amino acids, bicyclo[3.3.0]octane-5-amino-1-carboxylic acids (1), are prepared from 4,4-diethylcarboxylic bicyclo[3.3.0]oct-2-enone (3), which is available in bulk from 2 through the catalytic ...