二醇及氨基醇类鬼臼毒素衍生物的合成

以天然产物鬼臼毒素(1)为原料，合成了四种二醇及氨基醇类鬼臼毒素衍生物：4-O-乙基表鬼臼苦醇(4)，(1R,2S,3R,4S)-1-3',4',5'-三甲氧基苯基-2-氨甲基-3-羟甲基-4-乙氧基-6,7-亚甲二氧基-1,2,3,4-四氢萘(5)，(1R,2S,3R,4S)-1-3',4',5'-三甲氧基苯基-3-羟甲基-2-氨基-4-乙氧基-6,7-亚甲二氧基-1,2,3,4-四氢萘(6)和4-O-异丙基表鬼臼苦醇(7)。4～7及中间产物8～11都是新化合物。     

Synthesis of novel macrocyclic peroxides by bis(sym-collidine)iodine (I) hexafluorophosphate-mediated cyclization of unsaturated hydroperoxides and unsaturated alcohols

Bis(sym-collidine)iodine (I) hexafluorophosphate-mediated cyclization of unsaturated hydroperoxides, prepared by a variety of different methods, afforded the corresponding 10- to 20-membered macrocyclic peroxides having two or three peroxide units located within one ring in moderate yields. By analogy, cyclization of unsaturated alcohols having one or two peroxide bond in the chain afforded the corresponding cyclic ethers. The efficiency of the latter reactions were found to be a function of the structure of the alcohols.     

Palladium-catalyzed stereoselective hydrostannation of substituted propargyl alcohols with trineophyltin hydride

This paper reports results obtained in a study on the palladium-catalyzed hydrostannation of substituted propargyl alcohols with the bulky trineophyltin hydride (1). The reaction of 1 with 10 propargyl alcohols containing one up to three substituents, was carried out in THF at room temperature leading to the corresponding allylstannanes following in all cases a syn addition stereochemistry. These additions took place in good to excellent yields and, mostly, with a high degree of stereoselectivity. The results obtained suggest that the observed α/β regioselectivity might be ascribed to the steric bulk of the proximal substituents rather than to electronic effects. Full ¹H-, ¹³C-, and ¹¹⁹Sn NMR characteristics are included.     

Synthesis of enantiopure azetidines: a route to new β-amino alcohols

β-Amino alcohols possessing an E vinylsilane moiety were cyclized in the presence of N-bromosuccinimide to afford diastereoisomerically pure polyfunctional azetidines. These azetidines were then transformed into enantiopure β-amino alcohols with a Z vinylic bromide moiety.     

Indium-Promoted Allylation of Alkynes with Allylic Alcohols: Highly Regioselective Synthesis of Halogen-Substituted 1,4-Dienes

Indium-promoted allylation of alkynes by direct use of allyl alcohols as the allylating agents has been developed under mild conditions, in which a wide range of allylic alcohols and alkynes (both aromatic and aliphatic alkynes) could be tolerated, and the corresponding halogen-substituted 1,4-dienes were obtained in moderate to excellent yields.     

Zwitterionic imidazolium salt: An efficient organocatalyst for tetrahydropyranylation of alcohols

An aprotic imidazole based zwitterionic-salt, 4-(3-methylimidazolium)-butane sulfonate has been found to be an efficient organocatalyst for tetrahydropyranylation by the reaction of 3,4-dihydro-2H-pyran (DHP) and different aliphatic alcohols as well as various phenolic compounds. The notable advantages of the present method are general applicability to various alcohols, clean reaction, production of no hazardous waste, open air reaction conditions and high yields. The catalyst can be reused without the loss of significant catalytic activity.     

Synthesis of 1,2- and 1,4-amino alcohols from 1,3-dienes via oxazines. Rearrangements of 1,4-amino alcohol derivatives to oxazolines

Conjugated dienes were converted to 1,2-oxazines by reaction with an acyl nitroso dienophile. The oxazines were reduced to 1,4-N-acetylamino alcohols, which were rearranged to the corresponding oxazolines upon treatment with methanesulfonyl chloride or anhydride. The oxazolines yielded 1,2-N-acetylamino alcohols upon hydrolysis. Thus either 1,4- or 1,2-N-acetylamino alcohols are available from 1,3-dienes via this methodology. Experimental and spectral data are provided for all new compounds.     

Organolithium-induced enantioselective alkylative double ring-opening of epoxides: synthesis of enantioenriched unsaturated amino alcohols

The use of (−)-sparteine as an external chiral ligand in enantioselective organolithium-induced alkylative double ring-opening of dihydropyrrole epoxides and 7-azanorbornene-type epoxides gives unsaturated acyclic amino alcohols, and amino cyclohexenols in up to 87% ee.     

The use of acetylenic aldehydes in Baylis-Hillman reactions: synthesis of versatile allyl propargyl alcohols

The utility of acetylenic aldehydes in Baylis-Hillman reactions giving allyl propargyl alcohols in moderate to good yields is reported.     

Synthesis of α-trifluoromethyl unsaturated acids and derivatives

A one pot synthesis of α-trifluoromethyl unsaturated acids via a [3,3]-sigmatropic rearrangement of allyl (or propargyl) fluorovinyl ethers is described. By proto- and iodolactonization, these acids lead to the corresponding trifluoromethylated lactones.     

Gas chromatographic retention indices of trimethylsilyl derivatives of terpene alcohols

This paper presents the experimentally determined retention indices (RI(TMS)) for a set of 75 silylated terpenols (33 monoterpenols and 42 sesquiterpenols). The attempt was made to assess the dependence of RI(TMS) on RI (for non-silylated terpenols) and on RI(Ac) (for acetylated terpenols). Satisfactory linear regression parameters (RI(TMS)=b(0)+b(1)RI) were observed for tertiary substituted monoterpenols and primary or secondary substituted sesquiterpenols. The mass spectra of silylated terpenols that were not found in the available literature are in Supplementary information.     

Use of oxo-metallic derivatives in isomerisation: Reactions of unsaturated alcohols

The isomerisation of α-acetylenic alcohols to ethylenic carbonyl derivatives and the isomerisation of α-ethylenic alcohols to the corresponding allyl alcohols may be effected in good yields in a single step using oxometallic derivatives. The vanadate esters are particularly efficient. Mechanistic explanations are given.     

Synthesis of allylic alcohols via organopalladium additions to unsaturated epoxides

The reaction of aryl- and vinylpalladium compounds with vinylic and allylic epoxides provides an excellent, high yielding, regio- and stereoselective route to functionally substituted allylic alcohols which can be made catalytic in palladium.     

Pt-ZnO/C复合材料的合成及对醇类催化活性的研究

采用溶胶-凝胶法制备了ZnO微米颗粒,电沉积Pt合成了Pt-ZnO/C复合材料。利用X射线衍射仪（XRD）和扫描电子显微镜（SEM）对产物的晶型和形貌进行了表征,并利用循环伏安法（CV）研究了所得复合材料对甲醇和乙醇的电催化活性。实验结果表明,该催化剂在ZnO的质量分数为50%时对甲醇和乙醇氧化的电催化活性最好。
     

Synthesis of unsaturated phosphatidyl inositol-3,4,5-trisphosphate

Phosphatidylinositol polyphosphate (PIPx) are related with tyrosine kinase activation and cell proliferation and carcinogenesis. PIPx is an important target compound for synthetic organic chemist. PIPx having saturated fatty acid components have been reported. Recently we have succeeded in the synthesis of phosphatydylinositol-3,4,5-trisphosphate with unsaturated fatty acid component by the reaction of diethyl chlorophosphite with l,2-di-O-cyclohexylidene-3,4-O-(tetraisopropyldisiloxane 1,3-diyl)-6-O-(4-oxopentanoyl)-myo-inositol.     

Addition of ethyl urethane to olefins: A new approach to the synthesis of aliphatic carbamates

Several different palladium-based catalytic systems have been investigated for the addition of urethane (NH₂COOEt) to olefins. A catalytic system based on PdCl₂(CH₃CN)₂/CuCl/O₂ gave good results only in the case of the activated olefin methyl acrylate. Catalytic systems of the type Pd(acac)₂/phosphorus ligand/acid. previously used to catalyse the telomerisation of conjugated olefins with amines, gave the desired adduct. together with the product of addition of one molecule of urethane and two molecules of diolefin, in the case of isoprene and 2.3-dimethylbutadiene. The main by-products were the dimers of the diolefin, whereas the selectivity in urethane appears to be high. In no case could the addition of urethane to an unactivated non-conjugated olefin be achieved.     

Copper(II)-catalyzed allylation of propargylic and allylic alcohols by allylsilanes: a facile synthesis of 1,5-enynes

Propargylic alcohols undergo smooth deoxygenative allylation with allylsilanes in the presence of a solution of 10 mol % of copper(II) tetrafluoroborate in acetonitrile to afford the corresponding 1,5-enynes in good to high yields under mild and neutral conditions. Scandium triflate is also found to catalyze efficiently the nucleophilic substitution of propargylic alcohols with allylsilanes.     

Synthesis of 1,3,4-oxazaphospholines based on phosphorylated carbamates

Addition of alcohols to bis(chloromethyl)phosphinoyl isocyanate, as well as the reaction of bis(chloromethyl)phosphinoyl chloride with urethanes or their silylated derivatives, gave the corresponding phosphorylated carbamates which undergo cyclization into 1,3,4-oxazaphospholines under the action of Et₃N. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 810–811, April, 1999.