1,2,3,4-四氢环[b]吲哚在Pd/C和氢气的存在下进行还原，得到1,2,3a，4,8b-六氢环[b]吲哚。 应用： 吲哚2α-位上硫物种介导的功能化反应物 制备氧化剂四甲基哌啶-1-氧铵盐的反应剂 1,2,3,4-Tetrahydrocyclopent[b] indole undergoes reduction in the presence of Pd/C and hydrogen gas to yield 1,2,3,3a,4,8b-hexahydrocyclopent[b]indole. Application： Reactant for thionium species-mediated functionalization at the 2α-position of indoles Reactant for preparation of tetramethylpiperidine-1-oxoammonium salts as oxidants