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Allylic rearrangement: unusual products of bromination of N-acyl-2,2,4-trimethyl-1,2-dihydroquinolines and their use for N- and S-alkylation
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Allylic rearrangement: unusual products of bromination of N-acyl-2,2,4-trimethyl-1,2-dihydroquinolines and their use for N- and S-alkylation
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Allylic rearrangement: unusual products of bromination of N-acyl-2,2,4-trimethyl-1,2-dihydroquinolines and their use for N- and S-alkylation
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Journal Article
Allylic rearrangement: unusual products of bromination of N-acyl-2,2,4-trimethyl-1,2-dihydroquinolines and their use for N- and S-alkylation
2023
Overview
Bromination of
N
-acyl-2,2,4-trimethyl-1,2-dihydroquinolines with
N
-bromosuccinimide (NBS) in CCl
4
in the presence of Bz
2
O
2
proceeded at the 4-positioned methyl group. In a DMF solution, the direction of the reaction was determined by the nature of substituent at the nitrogen atom: the reaction with one equivalent of NBS can proceed either as described above, or at position 3 with the allylic rearrangement-type migration of the multiple bond. The use of two equimoles of NBS in DMF led to 3-bromo-4-bromometh-ylene-2,2-dimethyl-3,4-dihydroquinolines. The N- and S-alkylation reactions of 3- and 4-brominated isomers resulted in the same 4-
N
- and 4-
S
-methyl derivatives.
Publisher
Springer US,Springer Nature B.V
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