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Pronađeno 5 rezultata
eng Visible-light Driven Eosin Y Catalyzed C(sp2)-H Functionalization/C–O Bond Formation for Synthesis of Benzoxazoles
Mishra, Mangla; Srivastava, Vishal; Singh, Pravin K.; Singh, Praveen P.
Croatica Chemica Acta
Vol. 95, No. 1, 2022
Visible light mediated synthesis of benzoxazoles from benzanilides under an air atmosphere at room temperature is reported using eosin Y as an organophotoredox catalyst by functionalization of C–H/C–O bond formation. This methodology accepts a broad range of functional groups and affords the benzoxazoles by transition-metal-free organic photoredox catalysis under very mild conditions.
Hrčak ID: 293306
eng Facile Aerobic Photo-Oxidative Synthesis of Sulfinic Esters
Singh, Pravin K.; Singh, Praveen P.; Srivastava, Vishal
Croatica Chemica Acta
Vol. 91, No. 3, 2018
A mild and efficient one-pot visible light-induced method has been developed for the synthesis of sulfinic esters. Sulfinic esters are important structural elements that are frequently found in pharmaceutical agents and biologically active natural products. The routine procedure in the drug discovery and development process to prepare and fully characterize sulfinic esters make them a drug candidate for biological evaluation.
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Hrčak ID: 206020
eng Eosin Y Catalyzed Visible-light-promoted One –Pot Facile Synthesis of 1,3,4- Thiadiazole
Srivastava, Vishal; Singh, Pravin K.; Singh, Praveen P.
Croatica Chemica Acta
Vol. 88, No. 1, 2015
A novel one-pot visible light irradiated synthesis of 1,3,4-thiadiazole from aldehydes and
thioacyl hydrazides have been reported in presence of eosin Y as an organophotoredox catalyst at room
temperature under aerobic condition. This synthesis includes application of air and visible light as inexpensive,
readily available, non-toxic and sustainable regents, which fulfils the basic principle of green
chemistry.
Hrčak ID: 139130
eng Visible Light Promoted Allylic C–H Oxidation
Srivastava, Vishal; Singh, Pravin K.; Singh, Praveen P.
Croatica Chemica Acta
Vol. 90, No. 3, 2017
A mild and efficient one-pot visible light-induced method has been developed for the allylic oxidation. The oxidation of allylic systems has played a prominent role in this context as possibly the most widely applied C–H functionalization, owing to the utility of enones. The allylic C–H oxidation is relatively simple and predictable, even on a preparative scale, because active species generated at the allylic position are stabilized by the double bond.
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Hrčak ID: 184812
eng Eosin Y Catalyzed Visible-Light-Promoted Aerobic Oxidative Cyclization of 2-Aminobenzothiazole
Srivastava, Vishal; Singh, Pravin K.; Singh, Praveen P.
Croatica Chemica Acta
Vol. 88, No. 3, 2015
A mild and efficient one-pot visible light irradiated synthesis of 2-aminobenzothiazole <b>4(a–l)</b> from arylisothiocyanate <b>1(a–l)</b> and secondary amines <b>2</b> have been reported in presence of eosin Y as an organophotoredox catalyst at room temperature under aerobic condition. This synthesis includes application of air and visible light as inexpensive, readily available, high atom economy, non-toxic and sustainable regents.
Hrčak ID: 150526