A. G. LUGADE

LI-COR Biosciences (United States)

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N. R. AYYANGAR

National Chemical Laboratory

Ramesh B. Bambal

Daiichi Sankyo (India)

Nagaraj R. Ayyangar

National Chemical Laboratory

Pandurang V. Nikrad

Eltron Research

Steve Roemer

LI-COR Biosciences (United States)

Nikolai Gadjev

Sofia University "St. Kliment Ohridski"

P. P. Moghe

National Chemical Laboratory

Ramesh Raghavachari

United States Food and Drug Administration

Todor Deligeorgiev

Sofia University "St. Kliment Ohridski"

R. Karl Dieter

Clemson University

Cooperative Institutions

LI-COR Biosciences (United States)

National Chemical Laboratory

Georgia State University

Ashland (United States)

LungLife AI (United States)

Sofia University "St. Kliment Ohridski"

University of Geneva

Duke University

University of Southern Denmark

Technical University of Sofia

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Pressure-induced synthesis of an N-sulphony1-1H-azepine by sulphonyl-nitrene insertion into benzene

Journal of the Chemical Society Chemical Communications (1981)

Nagaraj R. Ayyangar Ramesh B. Bambal A. G. LUGADE

The thermal decomposition of toluene-p-sulphonyl azide (1) in an excess of benzene under a nitrogen atmosphere gave p-tosyl-1H-azepine (2), the yield of which increased with an increase in N2 pressure.

Azepine

Nitrene

Inert gas

10.1039/c39810000790

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Citations (11)

Facile Synthesis of N-Substituted 1H-Azepine Derivatives

Heterocycles (1982)

Nagaraj R. Ayyangar Ramesh B. Bambal A. G. LUGADE

The f a c i l e synthesis o f y-sulphonyl and +thoxycarbonyl substituted IH-azepines i n high y i e l d s by the pressure-induced sulphonylnitrene i n s e r t i o n reaction or.i n anhydrous solvents, the 1.3-dipolar azide addition reaction w i t h a m a t i c substrates containing electron-withdrawing substituents (e.g.dimethyl terephthalate) are described.

Azepine

10.3987/s(b)-1982-01-0077

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Citations (4)

ChemInform Abstract: Heterocyclic Quinonoid Chromophoric Systems. Part 7. Reaction of 2,3‐Dichloro‐1,4‐naphthoquinone with Nitromethane and Vinylogously Substituted Nitromethanes, Di‐ and Trinitrotoluenes.

ChemInform (1987)

N. R. AYYANGAR A. G. LUGADE M. N. RAJADHYAKSHA

Abstract A series of title reactions in the presence of heterocyclic bases affords products of type (I)‐(III).

Naphthoquinone

1,4-Naphthoquinone

10.1002/chin.198718158

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Citations (1)

Corrigenda

Journal of the Chemical Society Chemical Communications (1981)

Nagaraj R. Ayyangar Ramesh B. Bambal A. G. LUGADE Alan M. Rosan

N. R. Ayyangar, R. B. Bambal, A. G. Lugade and A. M. Rosan, J. Chem. Soc., Chem. Commun., 1981, 1092 DOI: 10.1039/C39810001092

10.1039/c39810001092

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Partial Reduction of Dinitroarenes to Nitroanilines with Hydrazine Hydrate

Bulletin of the Chemical Society of Japan (1983)

Nagaraj R. Ayyangar Uttam R. Kalkote A. G. LUGADE Pandurang V. Nikrad Vasant K Sharma

Abstract Dinitroarenes containing substituents such as hydroxyl and amine groups could be conveniently reduced with 3 molar equivalents of hydrazine hydrate in presence of Raney nickel catalyst in ethanol/1,2-dichloroethane solvent mixture to give a product wherein one of the two nitro groups was reduced to the amino group. The yields of the partial reduction products are good. Under similar conditions alkoxyl substituents in the o,p-position to the nitro groups were displaced by the hydrazino group to give 2,4-dinitrophenylhydrazine as the main product. The details of the reduction reaction are described.

Hydrazine (antidepressant)

Raney nickel

10.1246/bcsj.56.3159

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Citations (18)

ChemInform Abstract: 1‐Morpholino‐ and 1,8‐Dimorpholinonaphthalene: Coupling Components for New Azo Disperse Dyes.

ChemInform (1987)

N. R. AYYANGAR A. G. LUGADE P. P. Moghe

Abstract The azo dyes (VII) and (VIII) are prepared by coupling the diazotized amines (VI) to the morpholino‐naphthalenes (III) and (V) respectively, as outlined in the reaction scheme.

Morpholino

Azo coupling

Coupling reaction

10.1002/chin.198732296

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One-Pot Syntheses of Methylp- ando-Hydroxydithiobenzoates from Phenol Ethers

Synthesis (1988)

R. Karl Dieter A. G. LUGADE

Methyl p- and o-hydroxydithiobenzoates were prepared regiospecifically in a one-pot procedure from phenol methyl- and methoxymethyl, ethers, respectively. The p-hydroxy compounds were prepared by treatment of the methyl ethers with carbon disulfide, methyl iodide, and aluminum chloride. The second procedure involves ortho-metallation, carbon disulfide dithiocarboxylation, sulfur alkylation with methyl iodide, and in situ phenol deprotection with aluminum chloride/methyl iodide.

Methyl iodide

Carbon disulfide

Sodium iodide

10.1055/s-1988-27549

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Citations (14)

ChemInform Abstract: CATALYTIC REDUCTION OF NITROARENES WITH HYDRAZINE HYDRATE IN SUITABLE SOLVENTS

Chemischer Informationsdienst (1981)

N. R. AYYANGAR A. G. LUGADE Pandurang V. Nikrad V. K. Sharma

Abstract Am Beispiel der Dinitrodiphenylsulfone (I) wird die Reduktion aromatischer Nitro‐ Verbindungen mit Hydrazinhydrat in Gegenwart verschiedener Katalysatoren in verschiedenen Lösungsmitteln und bei verschiedenen Reaktionsbedingungen untersucht CH (3 Tabellen).

Hydrazine (antidepressant)

Reaction conditions

10.1002/chin.198147160

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Benzothiazolium cyanine dyes containing a trimethylene bridge in the polymethine chain

Dyes and Pigments (1992)

Todor Deligeorgiev Nikolai Gadjev A. G. LUGADE

Cyanine

Bridge (graph theory)

10.1016/0143-7208(92)80026-j

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Citations (1)

ChemInform Abstract: PRESSURE-INDUCED SYNTHESIS OF AN N-SULFONYL-1H-AZEPINE BY SULFONYL-NITRENE INSERTION INTO BENZENE

Chemischer Informationsdienst (1981)

N. R. AYYANGAR Ramesh B. Bambal A. G. LUGADE

Abstract Die Thermolyse des Tosylazids (I) in überschüssigem Benzol und unter Stickstoff ergibt die Verbindungen (II)‐(IV), wobei die Ausbeute des Azepins (II) mit steigendem Stickstoffdruck wächst.

Sulfonyl

Nitrene

Azepine

10.1002/chin.198150134

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