Shahid Bader Usmani

Steroidal alkaloids and an androstane derivative from the bark of Holarrhena pubescens

Abstract Two steroidal alkaloids and an androstane derivative have been isolated from the bark of H. pubescens and their structures elucidated through exhaustive 1D and 2D NMR studies (COSY-45, NOESY, J -resolved, HMQC).

Further constituents from the bark of Holarrhena pubescens

Three compounds, pubadysone [11 alpha-hydroxy-18,20-oxido-3-oxo-pregna-1,4,17(20)-triene] (1), puboestrene [3-acetoxy-17-oxo-1,3,5(10)-estratriene] (2) and pubamide [3,18-dioxo-11 alpha-hydroxycona-1,4-diene] (3), have been isolated from the bark of Holarrhena pubescens. Their structures have been established through spectroscopic studies.

A new triterpenoid from the leaves of Salvia triloba

The isolation and NMR spectral data of palestinol, a new triterpenoid from the leaves of Salvia triloba, are reported.

Alkaloids from the bark of Holarrhena pubescens

Abstract Three new alkaloids, namely, 4,6-dien-3-oxo- N -demethylconanine (pubescine), 1,4-dien-3-oxo- N -demethylconanine (norholadiene) and 3-dimethylamino-5-en-12α-hydroxyconanine (pubescimine), have been isolated from the bark of Holarrhena pubescens and their structures elucidated through exhaustive ID and 2D NMR (COSY-45, NOESY, J -resolved and HMQC).

Alkaloidal constituents of the bark of Holarrhena antidysenterica

Three steroidal alkaloids (1-3) of conanine series have been isolated from the bark of H. antidysenterica. 1 and 2 are new natural products while 3 has been reported earlier from this source

Two new constituents from the bark of Holarrhena pubescens

Two new compounds, norkurchamide (3,20-dioxo-11α-hydroxycona1,4-diene) (1) and pubatriol (3-oxo-11α,19,22-trihydroxycona-1,4-diene) (2) have been isolated from the bark of Holarrhena pubescens. Their structures have been established through spectroscopic studies.

A Novel Steroidal Saponin from Polianthes Tuberosa Linn.

Abstract From the bulbs of Polianthes tuberosa Linn., a novel steroidal saponin has been isolated. The molecular structure has been elucidated by extensive spectroscopic means and chemical reactions. The compounds has been identified as 2β,3β,16β,22β tetrahydroxycholesta-5-ene 16-O-β-D-apiofuranoside.

Alkyl Anhydronium Bases of Harmaline — A b-Carboline Alkaloid of Peganum harmala

This paper reports the synthesis of alkylanhydronium bases from harma- line on its reaction with different alkyl halides. There is no earlier procedure of formation of alkylharmaline with anhydronium skeleton, with these or any other reagent