124-25-4Relevant articles and documents
Long tailed cage amines: Synthesis, metal complexation, and structure
Dittrich, Birger,Harrowfield, Jack M.,Koutsantonis, George A.,Nealon, Gareth L.,Skelton, Brian W.
, p. 3433 - 3448 (2010)
The generation of amphiphiles derived from macrobicyclic hexamines of the "sarcophagine" class can be prepared through efficient and selective reactions involving the reductive alkylation, using long-chain aldehydes, of amino-functionalised sarcophagines when bound to Cu(ii) or Mg(ii). The Mg(ii) pathway is particularly convenient for the ultimate isolation of the free ligands, which can then be used to form metalloamphiphiles with a variety of metal ions. Structural studies have been made of one of the free (protonated) ligands and some of their complexes.
Flexible, polymer-supported synthesis of sphingosine derivatives provides ceramides with enhanced biological activity
El-Dahshan, Adeeb,Al-Gharabli, Samer I.,Radetzki, Silke,Al-Tel, Taleb H.,Kumar, Pradeep,Rademann, J?rg
, p. 5506 - 5512 (2014)
A polymer-supported route for the synthesis of sphingosine derivatives is presented based on the C-acylation of polymeric phosphoranylidene acetates with an Fmoc-protected amino acid. The approach enables the flexible variation of the sphingosine tail through a deprotection-decarboxylation sequence followed by E-selective Wittig olefination cleavage. d-Erythro-sphingosine analogs have been synthesized by diastereoselective reduction of the keto group employing LiAlH(O-tBu)3as reducing agent. The effect of ceramides and keto-ceramides on the proliferation of three cancer cell lines HEP G-2, PC-12 and HL-60 was investigated and a ceramide containing an aromatic sphingosine tail was identified as being most active.
Protolichesterinic acid derivatives: α-Methylene-γ-lactones as potent dual activators of PPARγ and Nrf2 transcriptional factors
Le Lamer, Anne-Cécile,Authier, Hélène,Rouaud, Isabelle,Coste, Agnès,Boustie, Jo?l,Pipy, Bernard,Gouault, Nicolas
, p. 3819 - 3822 (2014)
PPARγ and Nrf2 are important transcriptional factors involved in many signaling pathways, especially in the anti-infectious response of macrophages. Compounds bearing a Michael acceptor moiety are well known to activate such transcriptional factors, we thus evaluated the potency of α,β- unsaturated lactones synthesized using fluorous phase organic synthesis. Compounds were first screened for their cytotoxicity in order to select lactones for PPARγ and Nrf2 activation evaluation. Among them, two α-methylene-γ-lactones were identified as potent dual activators of PPARγ and Nrf2 in macrophages.
Oxidation of long-chain alcohols to aldehydes by the dipyridine chromic anhydride complex
Valicenti,Holman
, p. 389 - 392 (1976)
The oxidation of alcohols by the dipyridine chromic anhydride complex is judged to be most suitable for the preparation of long-chain aliphatic aldehydes. Thus, cis-9-octadecenol is oxidized in 93% yield within 30 min at room temperature with no detectabl
Selectivity control in oxidation of 1-tetradecanol on supported nano Au catalysts
Martínez-González,Ivanova, Svetlana,Domínguez, María I.,Cortés Corberán
, p. 113 - 119 (2016)
Selective oxidation of tetradecanol, a model higher fatty alcohol, on Au/CeO2-Al2O3 catalyst has been investigated to assess the factors that control selectivity. The analysis of the effect of operation conditions (temperature, run time and alcohol/metal (A/M) ratio) on catalytic performance revealed a quite complex reaction network, in which acid formation starts only after a certain level of conversion is reached. This level depends linearly on the total support surface available, indicating that it must be saturated by species generated by the reaction itself to allow acid formation to start. Addition of water to reaction medium did not modify this level, indicating that such species is not adsorbed water, as previously hypothesized, but probably spilled over hydrogen species. The resulting drastic change in the selectivity trends makes the ratio A/M a critical factor to control selectivity to aldehyde and to acid. Selectivity to ester is less sensible to operation parameters. It is noteworthy that aldehyde yields up to 27% with 90% selectivity, and acid yields up to 40% with 81% selectivity can be reached by proper selection of operation parameters.
Racemic gem disilyl alkane compound containing four silicon-hydrogen bonds, and sybthesis method and application of compound
-
Paragraph 0263-0268; 0269, (2019/05/15)
The invention discloses a racemic gem disilyl alkane compound containing four silicon-hydrogen bonds. The compound is as shown in a formula IV. The invention further discloses a synthesis method of the racemic gem disilyl alkane compound. The synthesis method comprises the following step of carrying out a reaction by taking alkyne as shown in a formula I and trihydrosilane as shown in a formula IIas raw materials and taking a chiral CoX-IIP complex as a catalyst in the presence of a reducing agent to obtain the racemic gem disilyl alkane compound containing four silicon-hydrogen bonds, wherein the compound is as shown in the formula IV. The method disclosed by the invention has mild reaction conditions, is simple and convenient to operate and has high atom economy. In addition, the reaction does not need addition of any salts of toxic transition metals (such as ruthenium, rhodium, palladium and the like), and the method has a relatively large practical application value in synthesis of medicines and materials. In addition, the reaction has a medium to excellent yield (51-99%) and high area selectivity (10:1-19:1, most parts larger than 19:1).
