Organoboron compounds are useful reagents in organic synthesis. Recently, the transition-metal catalyzed addition reactions of boron-heteroatom bonds to unsaturated organic compounds (diboration, borylstannation, borylsilylation, and thioboration) have been reported. These are useful in introducing simultaneously two functional groups into organic compounds. In this review we will describe these reactions by classifying into following features : (i) addition reactions to organic compounds containing C-C triple bond (alkynes, diynes, and enynes), (ii) addition reactions to organic compounds containing C-C double bond (alkenes, 1, 3-dienes, allenes, unsaturated carbonyl compounds, methylenecyclopropanes, and vinylcyclopropanes), (iii) addition reactions to other organic compounds.
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