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The data obtained by the authors in the field of chemistry of substituted borolanes and 2,3-dihydro-1<i>H</i>-boroles are summarized. The authors developed a selective method for the synthesis of five-membered boracarbocycles via transmetalation of aluminacarbocycles, obtained by the catalytic cycloalumination of unsaturated compounds (terminal olefins or acetylenes) with AlEt₃ in the presence of Cp₂ZrCl₂ as a catalyst by boron halides (BF₃·Et₂O, BCl₃, and BBr₃). Some examples of the use of this approach to modify steroid compounds (in particular, to introduce a borolan fragment into them) are described in this review.