A new and concise way to enamides by fluoroalkanosulfonyl fluoride mediated Beckmann rearrangement of α,β-unsaturated ketoximes
The reaction of α,β-unsaturated ketoximes with fluoroalkanosulfonyl fluorides in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) underwent the Beckmann rearrangement smoothly to afford the corresponding acid-sensitive enamides in moderate to excellent yields, which provides a new efficient method for the preparation of acid-sensitive enamides.
Yan, Zhaohua,Xu, Yun,Tian, Weisheng
supporting information
p. 7186 - 7189
(2015/02/02)
STEROIDS .LIII. TRANSFORMATION OF 3β-ACETOXY-5α-ANDROSTAN-17-ONE INTO 17α- AND 17β-AMINO DERIVATIVES OF 5α-ANDROSTAN-3β-OL
The epimeric 17α- and 17β-amino-5α-androstan-3β-ols were synthesized from 3β-acetoxy-5α-androstan-17-one.The configurations at the C17 atom were demonstrated by the 1H NMR method.
Nadaraia, N. Sh.,Sladkov, V. I.,Kuleshova, L. N.,Suvorov, N. N.
p. 481 - 485
(2007/10/02)
Process for the preparation of 17β-hydroxy-3-oxo-17α-pregn-4-ene-21-carboxylic acid γ-lactone
A new process utilizing certain novel intermediates for the preparation of 17β-hydroxy-3-oxo-17α-pregn-4-ene-21-carboxylic acid γ-lactone is described herein. The procedure utilizes readily available and inexpensive sarsasaponin as starting material.
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(2008/06/13)
Mechanism of hydroxylation of steroids. Hydroxylations of some isomers of 5α androstan 3β ol 17 one with Mucor griseo cyanus
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Valcavi,Martelli,Sironi,Tedeschi
p. 464 - 478
(2007/10/13)
4-CHLOROSTEROIDS. SYNTHESIS OF 4-BETA-CHLORO-DEHYDROISOANDROSTERONE ACETATE AND OF 4-CHLORO-4-ANDROSTEN-3 BETA-OL-17-ONE ACETATE.
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CAMERINO,DECASTIGLIONE,BOSISIO
p. 312 - 323
(2007/10/06)
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