Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 86, Issue 8, Pages 5616-5629Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.1c00103
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Funding
- National Natural Science Foundation of China [21572196, 21871227]
- Priority Academic Program Development of Jiangsu Higher Education Institutions [BK2013016]
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The InBr3-catalyzed reaction efficiently synthesized polysubstituted tetrahydrospiro[carbazole-1,3'-indolines] with good yields and exhibited excellent diastereoselectivity in generating different diastereoisomers compared to the TfOH-catalyzed reaction. The reaction mechanism involved the in situ generation of reactive dienophilic 3-alkenylindole, the Diels-Alder reaction, and the Lewis acid controlled diastereoisomerization process.
A simple InBr3-catalyzed domino reaction of indoles, phenylacetylenes, and various 3-methyleneoxindolines in toluene is described. This reaction not only provided a convenient synthetic protocol for polysubstituted tetrahydrospiro[carbazole-1,3'-indolines] in good yields but also gave completely different diastereoisomers of the tetrahydrospiro[carbazole-1,3'-indolines] to that of the previously reported TfOH-catalyzed one-pot reaction of indoles, acetophenones, and 3-methyleneoxindolines. Additionally, the InBr3-catalyzed reaction of the initially prepared 1,1'-bis(indolyl)phenylethanes with 3-phenacylideneoxindolines also gave the corresponding tetrahydrospiro[carbazole-1,3'-indolines] in good yields and with excellent diastereoselectivity. The reaction mechanism involved the sequential in situ generation of reactive dienophilic 3-alkenylindole, the Diels-Alder reaction, and the Lewis acid controlled diastereoisomerization process.
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