Reactions of α-haloacroleins with azides: highly regioselective synthesis of formyl triazoles
2019
Zhang, Dongsheng | Fan, Yingzhu | Yan, Zhongliang | Nie, Yi | Xiong, Xingquan | Gao, Lizhu
A general metal-free route to 1,4-disubstituted and 1,4,5-trisubstituted 1,2,3-triazoles was developed. α-Haloacroleins reacted with organic azides in a DMSO/H₂O mixture solvent at room temperature to produce 1,4-disubstituted triazoles (up to 99%) with exclusive regioselectivities. This protocol is convenient and scalable with a broad substrate scope including aliphatic and aromatic azides. The resulting triazoles exhibited an aldehyde group at the C4 position and demonstrated synthetic utilizations. One 1,2,3-triazole compound containing diastereotopic protons was also identified.
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