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Construction of a γ-Butyrolactone Moiety: A Facile Synthesis of 3β- Hydroxy-5,6-Dihydro-17β -Methoxy-Pregnan-21,16α-Carbalactone - a New D-Ring Fused Steroidal γ-Butyrolactone from an Abundant 20- Oxopregnane using Metal Mediated Halogenation as the Key Step

[ Vol. 12 , Issue. 8 ]


Preetismita Borah, Ashma Begum, Saroj Hazarika and Pritish Chowdhury   Pages 566 - 573 ( 8 )


A new D-ring fused steroidal γ-butyrolactone, 3β-hydroxy-5,6-dihydro-17β-methoxypregnan- 21,16α-carbalactone from abundant 20-oxopregnane,5,6-dihydro pregnenolone acetate using the high yield metal mediated C-21 functionalization reaction with MnO2-TMSCl/AcCl-AcOH system as the key step has been described. Furthermore, the application of this reaction paving a way to synthesize 3β,21-diacetoxy -16α,17α-epoxy-pregnan-20-one - a potent precursor towards the synthesis of a series of D-ring fused steroidal γ-butyrolactones has also been illustrated. The work highlights a convenient approach in constructing a D-ring fused steroidal γ-butyrolactone system from abundant 20-oxosteroids which might have general applicability in non-steroidal cyclic system.


γ-Butyrolactones, D-ring fused Steroidal γ-Butyrolactones, Antitumor Steroids, 5α, 20- Oxopregnanes, C-21 Functionalization.


Natural Products Chemistry Division, CSIR-North East Institute of Science & Technology, Jorhat 785006, India.

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