Hemisynthesis of methyl pyrethroates from γ-alkoxy-alkylidene malonates and isopropylidenediphenylsulfurane and isopropylidenetriphenylphosphorane
摘要:
Hemi synthesis of methyl pyrethroates from gamma-alkoxy-alkylidene malonates and isopropylidenediphenylsulfurane and isopropylidenetriphenylphosphorane is disclosed. It takes advantage of the high degree of stereocontrol observed in the cyclopropanation of gamma-alkoxy-alkylidene malonates by the above mentioned ylides. (C) 2004 Elsevier Ltd. All rights reserved.
Enantioselective syntheses of the assigned structures of the helibisabonols A and B
摘要:
The enantioselective syntheses of the compounds with the assigned structures of the helibisabonols A and B have been accomplished. Using an enzymatic desymmetrization of the sigma-symmetrical diol (route a) and a diastereoselective conjugate addition of the methyl to the enone with a chiral auxiliary (route b) we constructed the key tertiary stereogenic center at the benzylic position (C7) and then used an asymmetric dihydroxylation for assembling the C10 stereogenic center. In addition, possible diastereoisomers of the natural products were prepared and detailed comparisons of the H-1 and C-13 NMR spectra were conducted. As a result, the structure originally assigned to helibisabonol A may be revised to (7R,10R)-1. In the case of helibisabonol B, the (7R,10R)-2 would be reasonable based on a comparison of the NMR data and the biogenetic parallelism with helibisabonol A. (C) 2011 Elsevier Ltd. All rights reserved.
[EN] PYRROLO[2,3-B]PYRIDINE CDK9 KINASE INHIBITORS<br/>[FR] INHIBITEURS DE PYRROLO[2,3-B]PYRIDINE CDK9 KINASE
申请人:ABBVIE INC
公开号:WO2014139328A1
公开(公告)日:2014-09-18
Disclosed are compounds of Formula (IIa), wherein R1, R2, R3A, R3B, R3C, R3D, R3E, and R4 are as defined in the specification, and pharmaceutically acceptable salts thereof. The compounds may be used as agents in the treatment of diseases, including cancer. Also provided are pharmaceutical compositions comprising one or more compounds of Formula (IIa).
Stereoselective Synthesis of Cholesteryl Derivatives Bearing a Chiral Allenic Group in the Side Chain
作者:Alain Burger、Charles Hetru、Bang Luu
DOI:10.1055/s-1989-27161
日期:——
Two cholesteryl allenic stereoisomers (aS)-11 and (aR)-11 are prepared stereoselectively. The key step of the synthesis is the coupling of pregnenolone to the lithium salt of the optically active 5-ethynyl-1,3-dioxolane (S)-8 or (R)-8. These two chiral synthons are obtained from the enantiomer primary alcohol (S)-3 and (R)-3, which are prepared according to a new synthetic pathway from methyl (2S)- and (2R)-2,3-O-isopropylideneglycerate [(S)-1 and (R)-1].
Optically active (all-E,2R,2′R)-oscillol (= (all-E,2R,2′R)-3,4,3′,4′-tetradehydro-1,2,1′,2′-tetrahydro-ψ,ψ-carotene-1,2,1′,2′-tetrol; 1) was synthesized according to the C10 + C20 + C10 = C40 strategy, applying the Wittig reaction to couple the synthons 4 and 6. The chiral centre was introduced by a Sharpless dihydroxylation of 3-methylbut-2-enyl 4-nitrobenzoate (8).
光学活性的(清一色ë,2 - [R,2' - [R)-oscillol(=(清一色ë,2 - [R,2' - [R)-3,4,3',4'-四脱氢1,2,1',根据C 10 + C 20 + C 10 = C 40策略合成2'-tetrahydro-ψ,ψ-胡萝卜素-1,2,1',2'-tetrol; 1),采用Wittig反应偶联合成子4和6。通过3-甲基丁-2-烯基4-硝基苯甲酸酯的无尖锐的二羟基化作用引入手性中心(8)。
Verfahren zur Herstellung von Cholesterinderivaten und Zwischenprodukte dafür
申请人:F. HOFFMANN-LA ROCHE & CO.
Aktiengesellschaft
公开号:EP0063678A2
公开(公告)日:1982-11-03
Verfahren zur Herstellung von Cholesterinderivaten der Formel
worin R1 Wasserstoff oder Hydroxy ist, dadurch gekennzeichnet, dass man
a) ein Pregnanderivat der Formel
worin R" Wasserstoff, R3 und R5 zusammen eine 3a,5-Bindung und R6 C1-4-Alkoxy sind, oder R" Wasserstoff oder eine leicht spaltbare verätherte Hydroxygruppe, R3 eine leicht spaltbare verätherte Hydroxygruppe und R5 und R6 zusammen eine C-C-Bindung sind, mit einer Verbindung der Formel
worin X Wasserstoff oder Methyl ist, umsetzt,
b) aus der erhaltenen Verbindung der Formel
worin X, R", R3, R5 und R6 die obige Bedeutung haben, die β-Hydroxysulfongruppierung reduktiv eliminiert,
c) die erhaltene Verbindung der Formel
worin X, R", R3, R5 und R6 die obige Bedeutung haben, katalytisch hydriert,
d) die erhaltene Verbindung der Formel
worin X, R", R3, R5 und R6 die obige Bedeutung haben, zu einer Verbindung der Formel I hydrolysiert und
e) erwünschtenfalls ein erhaltenes Diastereomerengemisch von Verbindungen der Formel I auftrennt. Die Verbindungen der Formel sind Zwischenprodukte in der Herstellung von Vitamin D3-Derivaten.
一种制备式胆固醇衍生物的工艺
其中 R1 为氢或羟基,其特征在于
a) 式中的孕烷衍生物
式中 R "为氢、R3 和 R5 合在一起为 3a,5 键、R6 为 C1-4 烷氧基,或 R "为氢或易裂解的醚化羟基、R3 为易裂解的醚化羟基、R5 和 R6 合在一起为 C-C 键的式中化合物
其中 X 为氢或甲基、
b) 从得到的式化合物中
其中 X、R"、R3、R5 和 R6 具有上述含义,β-羟基磺酰基被还原消除、
c) 所生成的式化合物
其中 X、R"、R3、R5 和 R6 如上定义,催化氢化
d) 所生成的式化合物
其中 X、R"、R3、R5 和 R6 如上文所定义,水解成式 I 的化合物,以及
e) 如果需要,分离得到的式 I 化合物非对映混合物。式化合物是生产维生素 D3 衍生物的中间体。