Gold catalyzed intramolecular cyclization of (2-aminophenyl)-cyclopropyl methanols as an expedient route to 2,3-dihydro-1h-benzazepines and indolines.
We reported herein an efficient synthetic route of 2,3-dihydro-1H-benzazepines and indolines that relies on (4-CF3Ph)3PAuCl/AgOTf catalyzed intramolecular hydroamination of cyclopropyl methanols containing an aniline moiety. The methodology is applicable to a wide range of electron-donating, elec...
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Format: | Final Year Project |
Language: | English |
Published: |
2010
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Online Access: | http://hdl.handle.net/10356/39933 |
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Institution: | Nanyang Technological University |
Language: | English |
Summary: | We reported herein an efficient synthetic route of 2,3-dihydro-1H-benzazepines and
indolines that relies on (4-CF3Ph)3PAuCl/AgOTf catalyzed intramolecular hydroamination of
cyclopropyl methanols containing an aniline moiety. The methodology is applicable to a wide
range of electron-donating, electron-withdrawing, and sterically demanding substituted
(2-aminophenyl)-cyclopropyl methanol substrates that gave the corresponding
2,3-dihydro-1H-benzazepine and indoline products in yields of 23-92%. The mechanism is
suggested to involve activation of hydroxyl group of the substrate by (4-CF3Ph)3PAuCl/AgOTf
followed by ring opening of the cyclopropane moiety. Intramolecular cyclization in a 7-endo-trig
manner of intermediates derived from unactivated cyclopropyl methanols furnished the
2,3-dihydro-1H-benzazepine. On the other hand, intramolecular hydroamination of
intermediates derived from activated cyclopropyl methanols underwent 5-endo-trig cyclization
to give the indoline products. |
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