CAS: 539-88-8; Ethyl 4-Oxopentanoate

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CAS号64-17-5 乙醇 | CAS号123-76-2 乙酰丙酸 | CAS号3128-06-1 5-氧代己酸 | CAS号57-48-7 果糖 | CAS号1623-88-7 5-氯甲基呋喃-2-甲醛 | CAS号98-00-0 糠醇 | CAS号14583-98-3 1-tributylstann... | CAS号105-36-2 溴乙酸乙酯 | CAS号79-24-3 硝基乙烷 | CAS号140-88-5 丙烯酸乙酯 | CAS号1073-11-6 5-乙烯基-5-甲基四氢呋喃-2-酮 | CAS号1070-35-5 allyl levulinate | CAS号4911-54-0 4-甲基-4-戊烯酸乙酯 | CAS号14211-72-4 2-丁基-3-甲基环-2-戊酮 | CAS号14594-25-3 Ethyl 5-bromo-4... | CAS号941-43-5 1,3-Dioxolane-2... | CAS号21884-26-4 乙酰丙酸异丙酯 | CAS号21053-55-4 5-methyl-5-naph... | CAS号58917-25-2 (R)-γ-戊内酯

葡萄糖置于sulphated Alumina体系中,用 乙醇 作为反应溶剂,化学反应 3.0H,以24.4%的收率获得产物乙酰丙酸乙酯
参考文献:有序介孔so 4 2-/ Al 2 O 3的制备,表征及其在糠醇向乙酰丙酸乙酯转化中的催化活性
标题:有序介孔so 4 2-/ Al 2 O 3的制备,表征及其在糠醇向乙酰丙酸乙酯转化中的催化活性
摘要:通过蒸发诱导自组装(eisa)方法,然后在不同的煅烧温度(400oc-900oc)下进行磺化,制备了一系列有序的介孔so 4 2-/ Al 2 O 3(omsa)固体超强酸催化剂.).透射电子显微镜(tem)和小角x射线衍射(xrd)的结果表明,所有omsa都具有有序的介孔结构.n 2-布鲁诺尔-埃默特-泰勒(n 2-Bet)结果表明,Omsa的比表面积可达160-380 M 2 / G,平均孔径在8.6至9.8 Nm范围内.程序升温解吸的氨(nh 3-Tpd)表征证明omsa中含有超强酸,并且在600oc下煅烧的omsa中超强酸对氨的脱附达到25.9 Cm 3 / G Stp.吡啶吸附红外光谱(py-Ir)表明,所有omsa均主要由路易斯酸组成.omsa用于催化乙酰丙酸乙酯(el)的合成中的糠醇.在200oc下进行3小时的反应中获得最大产率(80.6%).重复使用四次后,证明了催化剂
DOI:10.1016/j.Jssc.2019.120991

专利信息

专利号:US-4866175-A
优先权日:1966-11-08
标 题 :Novel process for the synthesis of quinoxaline and benzimidazole-N-oxides
发明人：ISSIDORIDES COSTAS H; HADDADIN MAKHLUF J
权利人:RESEARCH CORP
摘要:The synthesis of quinoxaline and benzimidazole-N-oxides and of ester amd amide derivatives of 3-hydroxy-2-quinoxalinecarboxylic acid by a movel process consisting of the reaction between a benzofuroxan and an activated methylene-containing compound under basic conditions.

专利号:US-4861892-A
优先权日:1988-02-12
标题:Method for synthesis of deoxymannojirimycin
发明人：FLEET GEORGE W J
权利人:SEARLE & CO
摘要:A method is disclosed for the chemical synthesis of 1,5-dideoxy-1,5-imino-D-mannitol or 1,5-dideoxy-1,5-imino-L-mannitol from, respectively, 2,3-O-isopropylidene-L-gulono-γ-lactone or 2,3-O-isopropylidene-D-gulono-γ-lactone which comprises carrying out interconversion between the L-gulono and D-mannono forms or between the D-gulono and L-mannono forms, respectively, and connecting of C-1 to C-5 by nitrogen.

专利号:US-9434660-B2
优先权日:2014-07-09
标 题 :Methods for preparation of lycopenes from C15-wittig salts and methods for purification of high all-E containing and high 6Z containing C15-wittig salts
发明人：CHIU HAW-SHYI; LIN PO-WEI
权利人:ALLIED BIOTECH CORP
摘要:The present invention relates to methods for preparation of lycopenes, especially to lycopenes with high all-E contents or high 6Z contents from C15-Wittig slats mixtures.(with high all-E-contents and high 6Z-contents, respectively). C15-Wittig slats mixtures are purified and 6Z-C15-Wittig salts are extracted from the mixtures. The extracted 6Z-C15-Wittig salts are, used in the synthesis of lycopenes with high 6Z contents and the residues are used in the synthesis of lycopenes with high All-E contents.

专利号:US-6753449-B2
优先权日:2001-10-09
标题 :Cleavable linker for solid phase synthesis
发明人：GUO MAOJUN
权利人:ARQULE INC
摘要:Cleavable alkene-containing linkers and supports useful for the solid phase synthesis of chemical compounds, and combinatorial libraries of compounds, are disclosed. Also disclosed are methods of making and using the linkers and supports.

专利号:US-2024308991-A1
优先权日:2021-01-15
标 题:Process for the synthesis of reactive carbohydrates including antigen precursors for conjugation with a carrier material
发明人：SHIAO TZE CHIEH; MIGNANI SERGE; MOFFETT SERGE; VISHWAKARMA RAM
权利人:KORANEX CAPITAL
摘要:Carbohydrate of Formula (A)where R1 is H and n an integer from 1 to 5, is synthesized by reacting, under heating, compound (A0)with HO—(CH2)n—CHâ•?CH2 in the presence of an acid capable of liberating a proton, and cooling the reaction mixture to obtain a cooled mixture comprising compound (A).Carbohydrate of Formula (AAPG)where R2 is a monovalent protecting group, PG is a divalent protecting group and n an integer from 1 to 5, is synthesized by reacting, in the presence of a metal-containing zeolite, compound of Formula (APG)with compound of Formula (A1)where X is —I, —Br, —Cl, —CN, —OTf (Triflate), —OMs (Mesylate), —OTs (Tosylate), methylsulfate, or trichloroacetimidate. Deprotection of compound (AAPG) forms compound (AA)Carbohydrates (A) and (AA) can be coupled with a thiolated linker to form glycoconjugate precursors, which in turn are conjugatable with a carrier material such as a protein, peptide or polypeptide.

专利号:US-2004116724-A1
优先权日:1996-12-06
标 题:Stereoselective synthesis of 24-hydroxylated compounds useful for the preparation of aminosterols, vitamin D analogs, and other compounds
发明人：KINNEY WILLIAM A; JONES STEVEN; ZHANG XUEHAI; RAO MEENA N; BULLIARD MICHEL; MECKLER HAROLD; LEE NANCY
摘要:A method is described for stereoselectively reducing an unsaturated alkyl ketone substituent attached to a fused ring base. In this method, the unsaturated alkyl ketone reacts with a chiral oxazaborolidine reagent. This reaction stereoselectively reduces the unsaturated alkyl ketone to an unsaturated alkyl alcohol. The unsaturated alkyl alcohol can be further reduced, if desired, to produce a saturated alkyl alcohol. The fused ring base can be, for example, a steroid ring base or a base of a vitamin D analog. The process in accordance with the invention can be used with an alkeneone substituent (e.g., a 22-ene-24-one substituent) or an alkyneone substituent (e.g., a 22-yne-24-one substituent) on a steroid ring base to make squalamine or other useful aminosterol compounds and intermediates for making aminosterol compounds.