@article { ISI:000307202800028,
	title = {Supported copper triflate as an efficient catalytic system for the synthesis of highly functionalized 2-naphthol Mannich bases under solvent free condition},
	journal = {Tetrahedron Letters},
	volume = {53},
	number = {33},
	year = {2012},
	month = {AUG},
	pages = {4376-4380},
	publisher = {PERGAMON-ELSEVIER SCIENCE LTD},
	address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND},
	abstract = {<p>Various heterogeneous catalysts (Lewis acid) have been prepared and screened for the synthesis of Betti bases in an attempt to reduce the environmental hazards associated with the conventional homogeneous Lewis acid system. And we found especially Cu(OTf)(2)center dot SiO2 catalyzes the three-component coupling of aldehyde, 2-naphthol, and alicyclic amine to generate Betti base with high efficiency under neat conditions without additional co-catalyst or additive in air. The reaction is not sensitive to water and occurs smoothly in water as well. (c) 2012 Elsevier Ltd. All rights reserved.</p>},
	keywords = {Betti bases, single-crystal XRD, Solvent-free, Supported copper triflate, Three-component coupling},
	issn = {0040-4039},
	doi = {10.1016/j.tetlet.2012.06.022},
	author = {Dindulkar, Someshwar D. and Puranik, Vedavati G. and Jeong, Yeon Tae}
}
@article { ISI:000380138100025,
	title = {Bronsted-acid-mediated divergent reactions of betti bases with indoles: an approach to chromeno[2,3-b]indoles through intramolecular dehydrogenative C2-alkoxylation of indole},
	journal = {European Journal of Organic Chemistry},
	number = {20},
	year = {2016},
	month = {JUL},
	pages = {3441-3448},
	publisher = {WILEY-V C H VERLAG GMBH},
	address = {POSTFACH 101161, 69451 WEINHEIM, GERMANY},
	abstract = {<p>Divergent reactions of various 1-(aminoalkyl) naphthols and 2-(aminoalkyl) phenols (commonly known as Betti bases) with indoles under Bronsted acid catalysis is reported. With the reaction strategies, one can efficiently synthesize important indole derivatives such as 3-(alpha,alpha-diarylmethyl)indoles and chromeno[2,3-b]indoles. Furthermore, we disclose here a new C-C bond-cleavage reaction, in which naphthol and phenol behave as leaving groups to produce diarylmethanes. Inexpensive reagents such as p-toluenesulfonic acid monohydrate and molecular iodine are used to catalyze the reactions. No metal catalyst is required. The starting material of the reactions, Betti bases, are easily prepared from a three-component reaction of naphthol/phenol, aldehydes, and secondary amines. The mechanisms for the reactions are established through some control experiments. Quinone methide is the key intermediate for all the reactions reported herein.</p>},
	keywords = {Betti bases, C-O bond formation, Dearylation, Fused-ring systems, nitrogen heterocycles},
	issn = {1434-193X},
	doi = {10.1002/ejoc.201600546},
	author = {Deb, Mohit L. and Pegu, Choitanya Dev and Deka, Bhaskar and Dutta, Prantu and Kotmale, Amol S. and Baruah, Pranjal K.}
}
