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Govindarajan Manikumar

Pennsylvania State University

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Featured researches published by Govindarajan Manikumar.

Tetrahedron Letters | 1980

The photochemistry of proaporphines: a new route to the aporphines

S. Fazal Hussain; M. Tariq Siddiqui; Govindarajan Manikumar

Abstract Proaporphines undergo light catalyzed rearrangement. Pakistanamine ( 1 ) is thus converted into lumipakistanine ( 2 ), while pronuciferine ( 7 ) and N-acetylnorpronuciferine ( 8 ) afford the corresponding C-9 hydroxylated aporphines 9 and 10 . Possible biogenetic schemes for the formation of C-8, C-9-, and C-8,9-substituted aporphines are presented.

Journal of Organic Chemistry | 1981

Addition of dichlorocarbene to oxyberberine and berberine

Govindarajan Manikumar

Journal of Organic Chemistry | 1978

Studies in protoberberine alkaloids. 14. Use of a mixture of phosphorus pentabromide and phosphorus pentoxide as a cyclizing reagent in protoberberine synthesis

B. R. Pai; Sankaran Natarajan; Govindarajan Manikumar; Rangaswamy Rajaraman; H. Suguna

Journal of Organic Chemistry | 1978

Studies in protoberberine alkaloids. 15. Some aspects on the rate of methiodide formation in protoberberine chemistry

B. R. Pai; Sankaran Natarajan; H. Suguna; Govindarajan Manikumar

ChemInform | 1980

A SHORT ROUTE TO THE 8,13-DIOXO-14-METHOXYBERBINES

Govindarajan Manikumar; M. Shamma

ChemInform | 1981

ADDITION OF DICHLOROCARBENE TO OXYBERBERINE AND BERBERINE

Govindarajan Manikumar

ChemInform | 1978

SYNTHESES OF DL-CRYPTODORINE AND DL-7-METHYLCRYPTODORINE

B. R. Pai; S. Natarajan; H. Suguna; Govindarajan Manikumar

ChemInform | 1978

SYNTHESIS OF NORNANTENINE

Govindarajan Manikumar; B. R. Pai; H. Suguna

ChemInform | 1978

PHOTOLYSIS OF 1-(2′-BROMO-5′-HYDROXYBENZYL)-1,2,3,4-TETRAHYDRO-7-HYDROXY-6-METHOXYISOQUINOLINE UNDER ACIDIC AND ALKALINE CONDITIONS

B. R. Pai; H. Suguna; S. Rajeswari; Govindarajan Manikumar

ChemInform | 1978

STUDIES IN PROTOBERBERINE ALKALOIDS. 15. SOME ASPECTS ON THE RATE OF METHIODIDE FORMATION IN PROTOBERBERINE CHEMISTRY

B. R. Pai; S. Natarajan; H. Suguna; Govindarajan Manikumar; R. Rajaraman

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H. Suguna

University of Virginia

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B. R. Pai

Ciba Specialty Chemicals

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M. Tariq Siddiqui

Pennsylvania State University

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S. Fazal Hussain

Pennsylvania State University

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