@article {46056,
	title = {Regioselective oxidation of indoles to 2-oxindoles},
	journal = {Organic \& Biomolecular Chemistry},
	volume = {17},
	year = {2019},
	month = {JUL},
	pages = {6671-6677},
	type = {Article},
	abstract = {<p>Facile regioselective oxidation of indoles to 2-oxindoles promoted by sulfuric acid adsorbed on silica gel is reported. The demonstrated practical site-selective heterogeneous oxidation reactions conveniently take place with a broad substrate scope and functional group tolerances. The present oxidation strategy is also employed to accomplish the total synthesis of natural products donaxaridine and donaxarine. On the basis of analytical and spectral data it is evidenced that donaxarine stays in equilibrium with its hydrated ring opened form. The structural features essential for this type of oxidation and plausible mechanism are discussed in brief.</p>
},
	issn = {1477-0520},
	doi = {10.1039/c9ob00764d},
	author = {Shelar, Santosh V. and Argade, Narshinha P.}
}
@article {47620,
	title = {Facile synthesis of indolizinoindolone, indolylepoxypyrrolooxazole, indolylpyrrolooxazolone and isoindolopyrazinoindolone heterocycles from indole and imide derivatives},
	journal = {Organic \& Biomolecular Chemistry},
	volume = {19},
	year = {2021},
	month = {JUL 21},
	pages = {6160-6169},
	type = {Article},
	abstract = {Chemo-, regio- and diastereoselective coupling reactions of indole with imide derivatives leading to unique heterocyclic systems are demonstrated. Acid-induced 3-position coupling reactions of indole with cyclic imide derived lactamols followed by acid promoted 2-position cyclizations with the corresponding aldehydes are described to obtain the indolizinoindolones and benzoindolizinoindolones. Base induced 2-position coupling reactions of N-tosylindole with N-(2-iodoethyl)imides and the subsequent cyclizations provide indolylepoxypyrrolooxazole, indolylpyrrolooxazolone and indolyloxazoloisoindolone. Reductive cleavage of indolyloxazoloisoindolone to the corresponding alcohol followed by mesylation and base promoted N-cyclization affords the in situ air-oxidized pentacyclic product hydroxyisoindolopyrazinoindolone. A regioisomeric structural revision of the natural product from 1,2,5,6,7,11c-hexahydro-3H-indolizino[7,8-b]indol-3-one to 1,2,5,6,11,11b-hexahydro-3H-indolizino(8,7-b)indol-3-one is also reported in the present studies focussed on the methodologies for heterocyclic synthesis.},
	issn = {1477-0520},
	doi = {10.1039/d1ob00754h},
	author = {Shelar, Santosh V. and Argade, Narshinha P.}
}
@article {47828,
	title = {Wittig reactions of maleimide-derived stabilized ylides with alkyl pyruvates: concise approach to methyl ester of ({\textpm})-chaetogline A},
	journal = {Synthesis},
	volume = {53},
	year = {2021},
	month = {APR},
	pages = {2897{\textendash}2902},
	type = {Article},
	abstract = {A facile synthesis of methyl ester of chaetogline A is reported starting from the corresponding methyl 1-methyltryptophanate-derived- maleimide. A stereoselective Wittig olefination with a carbonyl function in methyl pyruvate followed by phosphorous pentoxide-induced- regioselective dehydrative cyclization are the essential reactions. An acid-induced thermodynamically driven stereoselective β- to α-position migration of the exocyclic C=C bond unit in ethyl{\textellipsis} 
},
	doi = {10.1055/A-1477-6043},
	author = {Argade, Narshinha P. and Shelar, Santosh V.}
}
@article {47403,
	title = {Wittig reactions of maleimide-derived stabilized ylides with alkyl pyruvates: concise approach to methyl ester of (+/-)-chaetogline A},
	journal = {Synthesis-Stuttgart},
	volume = {53},
	year = {2021},
	month = {APR },
	type = {Article},
	abstract = {<p>A facile synthesis of methyl ester of chaetogline A is reported starting from the corresponding methyl 1-methyltryptophanate-derived- maleimide. A stereoselective Wittig olefination with a carbonyl function in methyl pyruvate followed by phosphorous pentoxide-induced- regioselective dehydrative cyclization are the essential reactions. An acid-induced thermodynamically driven stereoselective beta- to alpha-position migration of the exocyclic C=C bond unit in ethyl tetrahydroindolizinoindolylidenepropanoate is described.</p>},
	keywords = {Amino acid, chaetogline A, dehydrative cyclization, maleimide, methyl pyruvate, Natural product, Wittig reaction},
	issn = {0039-7881},
	doi = {10.1055/a-1477-6043, Early Access Date = APR 2021},
	author = {Shelar, Santosh V. and Argade, Narshinha P.}
}
