Preparation method of 6-bromoindole derivative

The invention discloses a preparation method of a 6-bromoindole derivative: tertiary butyl 2-(6-bromo-1H-indole-3-yl) ethyl carbamic acid. The preparation method comprises the following steps: by using 6-bromoindole as an initial raw material, carrying out Friedel-Craft reaction; carrying out amidation; reducing; and carrying out t-butyloxycarboryl protective reaction to obtain the target product. The compound is an important medical intermediate.