- Ethylenediamine: An effective reagent for deacetylation of natural products
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The use of ethylenediamine in methanol is described for the selective cleavage of the acetate group in nimbin (1) to 6-deacetyl nimbin (1a) under microwave irradiation. This method enables to deacetylate without affecting other functional groups such as ,α,β-unsaturated ketone, ester, ether, etc. in certain tetranortriterpenoids and other acetate-containing natural compounds.
- Mohankumar, Ramasamy,Ilango, Kaliappan,Santhanakrishnan, Vichangal Pridiuldi,Radhakrishnan, Viswanathan,Narasimhan, Srinivasan
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experimental part
p. 851 - 858
(2010/12/25)
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- New Limonoids from the Roots of Melia azedarach Linn.
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Chemical and spectral evidences are presented for the structure of salannin, a new limonoid, 6-acetoxy-7α-hydroxy-3-oxo-14β,15β-epoxymeliac-1,5-diene and a new limonoid glycoside, 6-acetoxy-3β-hydroxy-7-oxo-14β,15β-epoxymeliac-1,5-diene-3-O-β-D-glucuronopyranoside isolated from the roots of Melia azedarach Linn.
- Srivastava, Santosh K.,Gupta, Hari O.
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p. 166 - 170
(2007/10/02)
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- A Correlation of Azadirone with Cedrelone
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Azadirone (I) has been hydrolysed and the resulting alcohol (VIII) oxidised to a 7-keto compound (IX) which on Barton oxidation yields 1,2-epoxycedrelone (XIII), cedrelone (VII) and two carboxylic acids (XIV) and (XV) derived by a benzilic acid rearrangement.Thus the neem limonoids have been correlated with cedrelone.
- Natarajan, S.,Chandrasekharan, S.,Govindachari, T. R.,Pai, B. R.
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p. 1061 - 1064
(2007/10/02)
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