Allene is a kind of compounds containing 1, 2-propadiene structure. In recent years, allenes and their derivatives have attracted many researchers' interest due to the unique nature. A variety of unsaturated compounds can react with allenes or their derivatives in a variety of cycloaddition reactions to prepare indole, pyridine, furan and other cyclic compounds. The recent progress in the cycloaddition reactions of allenic compounds catalyzed by different catalysts is summarized, including [4+2], [3+2], [2+2], [1+2+2], [2+2+2], [4+3], and [4+2+2] cycloaddition reactions, and the future development of allenic compounds is prospected.
Contents
1 Introduction
2[4+2] cycloaddition of allenes
2.1[4+2] cycloadditions of allenes with unsaturated ketones
2.2[4+2] cycloadditions of allenes with butadienes
2.3[4+2] cycloadditions of allenes with alkynes
2.4[4+2] cycloadditions of allenes with alkenes
2.5[4+2] cycloadditions of allenes with hydroxylamines
3[3+2] cycloaddition of allenes
3.1[3+2] cycloadditions of allenes with imines
3.2[3+2] cycloadditions of allenes with ketones
3.3[3+2] cycloadditions of allenes with alcohols
3.4[3+2] cycloadditions of allenes with butadienes
3.5[3+2] cycloadditions of allenes with aziridines
3.6[3+2] cycloadditions of allenes with alkenes
4[2+2] cycloaddition of allenes
4.1[2+2] cycloadditions of allenes with allenes
4.2[2+2] cycloadditions of allenes with alkenes
5[1+2+2] cycloaddition of allenes
6[2+2+2] cycloaddition of allenes
6.1[2+2+2] cycloadditions of allenes with alkynyl and cyanogens
6.2[2+2+2] cycloadditions of allenes with alkenyls
6.3[2+2+2] cycloadditions of allenes with isocyanates
6.4[2+2+2] cycloadditions of allenes with triazines
7[4+3] cycloaddition of allenes
8[4+2+2] cycloaddition of allenes
9 Conclusion