Lithium Bromide, an Inexpensive and Efficient Catalyst for Opening of Epoxide Rings by Amines at Room Temperature under Solvent-Free Condition
Author(s)
Chakraborti, AK
Rudrawar, S
Kondaskar, A
Griffith University Author(s)
Year published
2004
Metadata
Show full item recordAbstract
Lithium bromide has been found to be an inexpensive and efficient catalyst for the opening of epoxide rings by amines, and this provides an environmentally friendly method for the synthesis of β‐amino alcohols. Aromatic and aliphatic amines react with cycloalkene oxides to exclusively form trans‐2‐(aryl/alkylamino)cycloalkanols in high yields. A 98−100% selectivity in favour of nucleophilic attack at the benzylic carbon atom of styrene oxide is observed with aromatic amines. However, aliphatic amines exhibit a marginal preference for the reaction at the terminal carbon atom of the epoxide ring in styrene oxide. Non‐styrenoidal, ...
View more >Lithium bromide has been found to be an inexpensive and efficient catalyst for the opening of epoxide rings by amines, and this provides an environmentally friendly method for the synthesis of β‐amino alcohols. Aromatic and aliphatic amines react with cycloalkene oxides to exclusively form trans‐2‐(aryl/alkylamino)cycloalkanols in high yields. A 98−100% selectivity in favour of nucleophilic attack at the benzylic carbon atom of styrene oxide is observed with aromatic amines. However, aliphatic amines exhibit a marginal preference for the reaction at the terminal carbon atom of the epoxide ring in styrene oxide. Non‐styrenoidal, unsymmetrical alkene oxides undergo selective nucleophilic attack at the sterically less hindered carbon atom by aniline. The chelation effect of the Li+ ion enables selective opening of the epoxide ring in 3‐phenoxypropylene oxide in the presence of styrene oxide.
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View more >Lithium bromide has been found to be an inexpensive and efficient catalyst for the opening of epoxide rings by amines, and this provides an environmentally friendly method for the synthesis of β‐amino alcohols. Aromatic and aliphatic amines react with cycloalkene oxides to exclusively form trans‐2‐(aryl/alkylamino)cycloalkanols in high yields. A 98−100% selectivity in favour of nucleophilic attack at the benzylic carbon atom of styrene oxide is observed with aromatic amines. However, aliphatic amines exhibit a marginal preference for the reaction at the terminal carbon atom of the epoxide ring in styrene oxide. Non‐styrenoidal, unsymmetrical alkene oxides undergo selective nucleophilic attack at the sterically less hindered carbon atom by aniline. The chelation effect of the Li+ ion enables selective opening of the epoxide ring in 3‐phenoxypropylene oxide in the presence of styrene oxide.
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Journal Title
European Journal of Organic Chemistry
Volume
2004
Issue
17
Subject
Medicinal and biomolecular chemistry
Biologically active molecules
Organic chemistry