Hydroboration of alkenes is a classical reaction in organic synthesis in which alkenes react with boranes to give alkylboranes with subsequent oxidation resulting in alcohols. The double bond (pi-bond) of alkenes can be readily reacted with boranes owing to its high reactivity. However, the single bond (sigma-bond) of alkanes has never been reacted. To pursue the development of sigma-bond cleavage, we selected cyclopropanes as model substrates since they present a relatively weak sigma-bond. Herein, we describe an iridium-catalyzed hydroboration of cyclopropanes, resulting in beta-methyl alkylboronates. These unusually branched boronates can be derivatized by oxidation or cross-coupling chemistry, accessing "designer" products that are desired by practitioners of natural product synthesis and medicinal chemistry. Furthermore, mechanistic investigations and theoretical studies revealed the enabling role of the catalyst.