Výsledky vyhledávání - "Krishan Singal"

one-pot synthesis of pyrrolo-[3,4-d]isoxazoline-4,6-diones via nitrile oxides

Autor: B. Singh, Kewal Krishan Singal, Jaspreet Kaur Rajput

Publikováno v: Chemistry of Heterocyclic Compounds. 45:361-364

1,3-Dipolar cycloaddition of nitrile oxides generated in situ in the presence of variously substituted N-arylmaleimides and N-benzylmaleimide provides new pyrrolo[3,4-d]izoxazoline-4,6-diones in good yields. The whole procedure could be performed in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::319bdbf88308dd311fb3b96782c09b37
https://doi.org/10.1007/s10593-009-0265-z

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REGIOSELECTIVE SYNTHESIS OF 1,2-DIARYLBENZAZETIDENES VIA [2 + 2] CYCLOADDITION REACTIONS OF BENZYNE WITH AZOMETHINES

Autor: Kewal Krishan Singal, Jaswinder Kaur

Publikováno v: Synthetic Communications. 31:2809-2815

[2 + 2] Cycloaddition reactions of benzyne generated in situ with various substituted azomethines have been carried out leading to the synthesis of 1,2-diarylbenzazetidenes in good yields with a high degree of regioselectivity.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5df44c8327e1dc6cbf354fb68c0ba549
https://doi.org/10.1081/scc-100105330

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Cycloaddition Reactions of N-Sulphdvylanilines and N-(αCyano-α-aryl)-Methylanilines

Autor: Baldev Raj, Kewal Krishan Singal, Baldev Singh

Publikováno v: Synthetic Communications. 29:911-915

Through the cycloaddition of N-(α-cyano-α-aryl)-methylanilines (II) on to N-sulphinylanilines (III) are synthesized 2,3,5-triaryl-4-imino-2H, 3H, 5H-[1.2.5]thiadiazoIidin-l-oxides (TV) in aood vields.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b45ee551caf2e3069dc548ea2dfdb37e
https://doi.org/10.1080/00397919908086052

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1,3-Dipolar Cycloaddition Reactions of C-(2-Nitro)-styryl-N-phenyl Nitrone Leading to the Regiospecific and Stereospecific Synthesis of New Isoxazolidine Derivatives

Autor: Kewal Krishan Singal

Publikováno v: Synthetic Communications. 26:3571-3577

New substituted isoxazolidine derivatives have been synthesized through regiospecific and stereospecific 1,3-dipolar cycloadditions of C-(2-nitro)-styryl-N-phenyl nitrone with reactive dipolarophiles in excellent yields and effects of substituents ha

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ad00b0ea0b2d6a9538692434195e669f
https://doi.org/10.1080/00397919608003767

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Studies in 1-Aza-1,3-butadienes: Diels-Alder Cycloaddition Reactions of 1,4-Diaryl-1-aza-1,3-butadienes with Aryl Sulphonyl Nitrosites Leading to the Synthesis of New Oxadiazines

Autor: Baldev Singh, Baldev Raj, Kewal Krishan Singal

Publikováno v: Synthetic Communications. 23:107-114

1,4-Diaryl-1-aza-1, 3-butadienes (I) undergo a stereospecific 1,4-cycloaddition reaction with aryl sulphonyl nitrosites (II) generated ‘in situ’ by the reaction of aryl sulphinic acid and ethyl nitrite to yield six-membered cycloadducts character

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3ddd6cf69ea638a1ca537c8fabd8c654
https://doi.org/10.1080/00397919308020408

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