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1.
An efficient (in terms of experiment and time) synthetic procedure for chloromethyl methyl ether (MOM-Cl) is described using heteropolyacids as catalysts.  相似文献   

2.
Reaction of aromatic primary amines with methylisothiocyanate (MITC) yielded N-methyl-N1-(benzelene-1-yl)thioureas which underwent oxidative cyclization in the presence of bromine in acetic acid, at room temperature, affording the title compounds.  相似文献   

3.
Shui-Ming Lu  Ru-Yu Chen 《合成通讯》2013,43(19):3443-3450
Nineteen novel O,O-diphenyl l-(5-alkyl-1, 3,4-thiadiazol-2-yl) amino-1-arylmethylphosphonates were synthesized by the three-component condensation reactions of 2-amino-5-alkyl-1,3,4-thiadiazoles with triphenyl phosphite and aromatic aldehydes in the presence of acetic acid.  相似文献   

4.
Isoxazolo[5,4‐d]pyrimidine‐4,6(5H,7H)diones 2a – 2f have been synthesized from the reaction of ethyl 5‐amino‐3‐methyl‐4‐isoxazole carboxylate ( 1 ) with aryl isocyanates in the presence of Keggin heteropolyacid H3[PW12O40] as a green solid acid catalyst at room temperature in a one‐pot process in good yields.  相似文献   

5.
In a cheap and eco-friendly process, primary and secondary alcohols were easily protected as bis(methoxyphenyl)methyl (BMPM) ethers in good yields using CuBr2 as a catalyst in acetonitrile at room temperature. Deprotection could easily be achieved using the same catalyst but in ethanol. Both Cu-catalyzed protection and deprotection were orthogonal to other methods and fully compatible with other functional groups.  相似文献   

6.
A series of 4-formyl-, 4-acetyl- and 4-(l'-hydroxyethyl)sydnones have been prepared in good yields by reaction of sydnone with butyllithium or a Grignard reagent and N,N-dimethylformamide, N,N-dimethylacetamide and acetylaldehyde, respectively.  相似文献   

7.
2',3'-O-异亚丙基-5'-O-[N,N-二(2-氯乙基)磷酰胺基]核苷的合成陈茹玉,迟国臣,陈小茹(南开大学元素有机化学研究所,天津,300071)关键词核苷,亚磷酰化,抗肿瘤活性很多核苷类化合物具有很好的抗肿瘤、抗病毒等生物活性,某些化合物已...  相似文献   

8.
A copper-catalyzed oxidative esterification of 2-carbonyl substituted phenols from the alcohol oxidation level is described. This protocol represents direct access to a range of 2-carbonylated aryl benzoate derivatives, which are important building blocks in the synthesis of natural and pharmacological compounds.  相似文献   

9.
10.
A series of 8-halogen- (Cl,Br)-substituted apocodeines was prepared by the rearrangement of the corresponding 1-halogen-substituted codeines. O-demethylation of the apocodeines yielded the 8-halogenoapomorphines. 8-bromo-substituted morphothebaine derivatives have been conveniently prepared by direct bromination.  相似文献   

11.
A novel method for the synthesis of oligoribonucleotides using 1-(2-cyanoethoxy)ethyl (CEE) as a 2′-hydroxy protecting group has been developed. A CEE group was introduced to the 2′-position of N-acyl-3′,5′-O-silyl-protected ribonucleosides under acidic conditions in good yields. The 2′-O-CEE group was found to be stable in an aqueous or ethanolic ammonia and was quickly removed by treatment with anhydrous tetrabutylammonium fluoride (TBAF). A combination of the use of N-acyl and 2′-O-CEE protecting groups enabled a reliable and complete two-step deprotection, first with NH3–EtOH, then with TBAF in THF, without cleavage of internucleotidic linkages.  相似文献   

12.
在水热条件下合成了一个新颖的夹心结构四核镍有机-无机杂化锗钨酸盐[Ni(dien)(H2O)3]2·[Ni(Hdien)2]{[Ni(dien)]2Ni4(H2O)2(GeW9O34)2}·10H2O(1), 利用X射线单晶衍射确定了其结构, 并通过红外光谱、热重、X射线粉末衍射、X射线能谱和元素分析对其进行了表征. 其晶体属三斜晶系, P1, a=1.1937(3) nm, b=1.4323(3) nm, c=1.6394(4) nm, α=93.424(2)°, β=96.058(3)°, γ=109.758(4)°, V=2.6094(1) nm3,Z=1. X射线单晶衍射结果表明, 化合物1是由夹心构型的多阴离子通过镍-二乙烯三胺配阳离子连接形成的一维线性结构.  相似文献   

13.
Reactions of 3-tributylstannyl-2-(trimethylsilymethyl)propene with acid chlorides or aldehydes proceed smoothly without any catalytic activation to afford allylsilanes bearing various functionalities.  相似文献   

14.
Zinc oxide (ZnO) is a highly efficient catalyst for the acylation of a variety of alcohols, phenols and amines with acid chlorides or acid anhydrides under solvent free conditions. Primary, secondary, tertiary, allylic and benzylic alcohols, diols and phenols with electron donating or withdrawing substituents can be easily acylated in good to excellent yield.  相似文献   

15.
16.
Certain phenols and naphtols were nitrated regioselectively with NaNO2 in the presence of KHSO4 at 50 °C in high yields.  相似文献   

17.
The synthesis ofp-(5-fluoro-2,4-dinitro-1-phenylazo)-N,N-dimethylaniline and its reactions with phenoles top-(2,4-dinitro-5-phenoxy-1-phenylazo)-N,N-dimethylanilines and the use of the resulting coloured products for the TLC determination of phenoles is described.
  相似文献   

18.
5-Hydroxy-2-(2-phenylethyl)chromone(1) was synthesized from 2,6-dihydroxyacetophenone(7) obtained via four-steps resorcinol-reacting with phenylpropionic acid,the procedures involved are Baker-Venkataraman rearrangement and cyclization which are easy to conduct,the overall yield is 32%.  相似文献   

19.
Tetrahydropyranyl (THP), methoxymethyl (MOM), and benzyloxymethyl (BOM) phenyl/alkyl ethers were efficiently cleaved to the corresponding parent hydroxyl compounds in good yields using catalytic amounts of Ce(SO4)2·4H2O by microwave-assisted or conventional heating in methanol solution. Intramolecular and competitive experiments demonstrated the chemoselective deprotection of THP ethers in the presence of triisopropylsilyl (TIPS) and tert-butyldiphenylsilyl (TBDPS) phenyl ethers.  相似文献   

20.
在水热条件下合成了一种新型超分子化合物,通过元素分析、红外光谱、热重分析和X射线单晶衍射方法确定了其晶体结构.结构分析表明该晶体属于单斜晶系,C2/m空间群,晶胞参数a = 1.264 3(3) nm, b = 2.106 9(4) nm, c = 1.005 7(2) nm, α = 90°, β = 110.16(3)°, γ = 90°, V = 2.514 9(9) nm3, Z = 2, R1 = 0.061 8, wR2 = 0.179 4.  相似文献   

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