Muhammad A. Rashid | Researchain

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Featured researches published by Muhammad A. Rashid.

Natural Product Research | 2006

New ceramides from Platytaenia multicaule.

Viqar Uddin Ahmad; Muhammad Zubair; Muhammad Athar Abbasi; Farzana Kousar; Muhammad A. Rashid; Nasir Rasool; R. B. Tareen

Phytochemical investigation of Platytaenia multicaule resulted in the isolation of two new ceramides, N-triacontylpentadecanamide (1) and 1,3,4-trihydroxy-2,dodecanoylamino-(24E)-unacotenene (2), along with two known compounds, β-sitosterol (3) and β-sitosterol glycoside (4). The structure elucidation of the isolated compounds was based primarily on 1D and 2D NMR analyses, including COSY, NOESY, HMQC, and HMBC correlations.

Heterocycles | 2005

A New α-Glucosidase Inhibiting Dithiadiazetidin Derivative from Symplocos racemosa

Muhammad Athar Abbasi; Viqar Uddin Ahmad; Muhammad Zubair; Muhammad A. Rashid; Shamsun Nahar Khan; Umar Farooq; M. Iqbal Choudhary; Klaus-Peter Zeller

The phytochemical investigation of the n-butanol soluble fraction of Symplocos racemosa Roxb. resulted in the isolation of a new dithiadiazetidin derivative; symploate (1). Its structure was established through various 1Dand 2D NMR techniques together with high-resolution mass spectrometric techniques and spectral evidences. The symploate (1) showed moderate inhibitory activity against α-glucosidase in a concentration-dependent fashion with an IC 5 0 value of 691.1 ′ 3.29 μM.

Tetrahedron | 2008

Synthesis of functionalized diaryl sulfides based on regioselective one-pot cyclizations of 1,3-bis(trimethylsilyloxy)-1,3-butadienes

Muhammad A. Rashid; Nasir Rasool; Muhammad Adeel; Helmut Reinke; Christine Fischer; Peter Langer

Journal of Organic Chemistry | 2007

Efficient Synthesis of Salicylates by Catalytic [3 + 3] Cyclizations of 1,3-Bis(silyl enol ethers) with 1,1,3,3-Tetramethoxypropane

Muhammad Sher; T. H. Tam Dang; Zafar Ahmed; Muhammad A. Rashid; Christine Fischer; Peter Langer

Tetrahedron Letters | 2007

Regioselective synthesis of diaryl sulfides by [3+3] cyclizations of 1,3-bis(trimethylsilyloxy)-1,3-dienes

Muhammad A. Rashid; Helmut Reinke; Peter Langer

Tetrahedron | 2008

Synthesis of 1-azaxanthones by condensation of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 3-(cyano)benzopyrylium triflates and subsequent domino ‘retro-Michael/nitrile-addition/heterocyclization’ reaction

Muhammad A. Rashid; Nasir Rasool; Bettina Appel; Muhammad Adeel; Vahuni Karapetyan; Satenik Mkrtchyan; Helmut Reinke; Christine Fischer; Peter Langer

Tetrahedron Letters | 2008

Synthesis and reactions of hydroxyspiro[5.2]cyclooctenones based on the cyclization of the dianions of acetone and diethyl 2-oxopropylphosphonate with 1,1-diacylcyclopropanes

Nasir Rasool; Muhammad A. Rashid; Muhammad Adeel; Helmar Görls; Peter Langer

Polish Journal of Chemistry | 2006

Antioxidant Flavonoids from Pulicaria undulata

Viqar Uddin Ahmad; Nasir Rasool; Muhammad Athar Abbasi; Muhammad A. Rashid; Farzana Kousar; Muhammad Zubair; A. Ejaz; Muhammad Iqbal Choudhary; R. B. Tareen

Tetrahedron | 2008