Regioselective Diels-Alder cycloadditions and other reactions of 4,5-, 5,6-, and 6,7-indole arynes.
Regioselective Diels-Alder cycloadditions and other reactions of 4,5-, 5,6-, and 6,7-indole arynes.
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DOI:
10.1016/j.tetlet.2008.10.086
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发表时间:
2009-01-07
影响因子:
1.8
通讯作者:
Buszek, Keith R.
中科院分区:
文献类型:
--
作者:
Brown, Neil;Luo, Diheng;Velde, David Vander;Yang, Shaorong;Brassfield, Allen;Buszek, Keith R.
The regioselectivity of Diels-Alder cycloadditions of indole arynes (indolynes) at all three benzenoid positions was examined. Cycloadditions with the 4,5-and 5,6-indolynes, derived via metal-halogen exchange from the corresponding o-dibromo indoles, showed essentially no selectivity with 2-t-butylfuran. In contrast, the 6,7-indolyne displayed virtually complete preference for the more sterically congested cycloadduct. This same cycloadduct undergoes a facile acid-catalyzed rearrangement to afford the annulated enone, or alternatively, undergoes hydrolysis and oxidation in the presence of air to give the indolobenzoquinone. The 5,6-difluoroindoles show anomolous behavior and give either 5-fluoro-6,7-indolynes with n-BuLi in ether, or 5,6-indolynes with n-BuLi in toluene. We have also demonstrated that benzenoid indolynes can be easily and conveniently generated by the fluoride-induced decomposition of o-trimethylsilyl triflates.
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DOI:
10.1002/cber.19580910714
发表时间:
1958-01-01
期刊:
CHEMISCHE BERICHTE-RECUEIL
影响因子:
--
作者:
HUISGEN, R;ZIRNGIBL, L
通讯作者:
ZIRNGIBL, L
影响因子:
1.8
作者:
NAKATSUKA, SI;MASUDA, T;GOTO, T
通讯作者:
GOTO, T
影响因子:
1.8
作者:
GRIBBLE, GW;KEAVY, DJ;PALS, MA
通讯作者:
PALS, MA
影响因子:
3.6
作者:
NEWMAN, MS;KANNAN, R
通讯作者:
KANNAN, R
影响因子:
1.8
作者:
MACLEOD, JK;MONAHAN, LC
通讯作者:
MONAHAN, LC