Les alcools α-acetyleniques complexes a l'aide du dicobalt八carbonyle sont reduits par le le tetrahydroborate de sodium en存在 d'acide trifluoroacetique puis oxydes par lenitrogen ferrique afin d'obtenir les acetyleniques
One‐Pot Catalytic Enantioselective Synthesis of 2‐Pyrazolines
作者:Connor J. Thomson、David M. Barber、Darren J. Dixon
DOI:10.1002/anie.201811471
日期:2019.2.18
A scalable, one‐pot, enantioselective catalytic synthesis of 2‐pyrazolines from beta‐substituted enones and hydrazines is described. Pivoting on a two‐stage catalytic Michael addition/condensation strategy, the use of an aldehyde to generate a suitable hydrazone derivative of the hydrazine was found to be key for curtailing background reactivity and tuning the catalyst‐controlled enantioselectivity
Amphiphilic 1-Deoxynojirimycin Derivatives through Click Strategies for Chemical Chaperoning in N370S Gaucher Cells
作者:Jennifer D. Diot、Isabel Garcia Moreno、Gabriele Twigg、Carmen Ortiz Mellet、Karsten Haupt、Terry D. Butters、José Kovensky、Sébastien G. Gouin
DOI:10.1021/jo201125x
日期:2011.10.7
In Gaucherdisease (GD), mutant β-glucocerebrosidases (β-GCase) that are misfolded are recognized by the quality control machinery of the endoplasmic reticulum (ER) and degraded proteolytically. Hydrophobic iminosugars can be used as pharmacologicalchaperones to provide an improvement in the folding of the enzyme and promote trafficking from the ER. We have developed here an efficient click procedure
17.beta.-Ethynyl-3,17.alpha.-estradiol and derivatives thereof
申请人:Ortho Pharmaceutical Corporation
公开号:US03983112A1
公开(公告)日:1976-09-28
17.beta.-ethynyl-3,17.alpha.-estradiol and derivatives thereof are prepared by epimerization of 17-acyl esters of 17.alpha.-ethynyl-3,17.beta.-estradiol 3-ethers. 17.beta.-ethynyl-3,17.alpha.estradiol and its derivatives are active as post-coital antifertility agents and inhibit the growth of or reduce the size of the prostate gland and the seminal vesicle.
On the formation of allenes in the steroid series III.: Synthesis and reactions of 3-methoxy-17α-hydroxy-17β-ethynyl-1,3,5(10)-estratriene (“epimestranol”)
作者:L.A. van Dijck、B.J. Lankwerden、J.G.C.M. Vermeer
DOI:10.1002/recl.19770960708
日期:——
“Epimestranol” (6) has been prepared from the 16α,17-epoxide 5 by reduction with LiAlH4. The structures of several by-products have been elucidated and a mechanism for their formation is discussed. Both “mestranol” (3) and “epimestranol” failed to form p-tosylates and only “mestranol” could be converted into the p-toluenesulfinate which readily rearranged to the allenic sulfone 14. “Epimestranol” was
On the formation of allenes in the steroid series IV. Synthesis and structure of several 3-methoxy-19-nor-1,3,5(10)-17(20), 20-pregnapentaenes, substituted at C(21)
作者:L.A. van Dijck、B.J. Lankwerden、J.C.G.M. Vermeer
DOI:10.1002/recl.19790981202
日期:——
Pairs of steroid 17(20),20-allenes, epimeric at C(21), have been obtained by LiAlH4(D4)/AlCl3 reduction of 17α/β-hydroxy-17β/α-alkynyl steroids, confirmed by means of optical rotation differences and NMR spectroscopy. In all cases the reduction proved to be fully stereospecific, confirming the cis-SN2′ mechanism, postulated in part II1.
通过LiAlH 4(D 4)/ AlCl 3还原17α/β-羟基-17β/α-炔基类固醇获得了成对的类固醇17(20),20-丙二烯,在C(21)对映体旋光差异和NMR光谱分析。在所有情况下,还原均被证明是完全立体定向的,从而证实了顺式S N 2'机制,这在第二部分1中有假设。