CAS: 589-93-5; 2,5-Dimethylpyridine

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3-乙酰基二氢-5-甲基-2(3H)-呋喃酮置于dicobalt octacarbonyl 吡啶,盐酸羟胺,溶剂黄146体系中,用 苯 作为反应溶剂,化学反应 18.0H,反应生成 2,5-二甲基吡啶
参考文献:羰基钴催化酯和内酯与氢硅烷和一氧化碳的反应.一种引入甲硅烷氧基亚甲基的新合成方法
标题:羰基钴催化酯和内酯与氢硅烷和一氧化碳的反应.一种引入甲硅烷氧基亚甲基的新合成方法
摘要:酯和内酯与氢硅烷和一氧化碳在 Co/sub 2/(Co)/sub 8/ 存在下的催化反应已被详细研究,重点是它们在有机合成中的效用.乙酸仲烷基酯的催化反应经过一氧化碳的完全结合,得到(甲硅烷氧基亚甲基)烷烃(烯醇甲硅烷基醚).仲烷基酯类型的内酯类似地反应.甲硅烷氧基甲基化产物转化为醛.乙酸伯烷基酯以非选择性方式产生多种产物.在叔烷基酯的情况下,除了桥头烷基乙酸酯外,没有发生一氧化碳的掺入.已经提出了催化反应的机理,以及羰基硅钴的重要性,R/sub 3/sico(Co)/sub 4/,作为已提出的关键催化剂种类.r/sub 3/sico(Co)/sub 4/ 中的硅对酯中氧原子的高亲和力被认为是形成作为中间体的烷基羰基钴的驱动力.这一步说明了一种形成碳-过渡金属键的新方法.
DOI:10.1021/ja00283A035

专利信息

专利号:US-11926589-B2
优先权日:2019-07-09
标 题 :Process for the synthesis of non-racemic cyclohexenes
发明人：REISMAN SARAH; ROMBOLA MICHAEL; LADD CAROLYN L; MCLAUGHLIN MARTIN JOHN; ZUEND STEPHAN; GOETZ ROLAND
权利人:BASF CORP; CALIFORNIA INST OF TECHN
摘要:This invention relates to a process for the synthesis of a non-racemic cyclohexene compound of formula (I) by a Diels-Alder reaction of a compound of formula (II) with a compound of formula (III) wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 and Y have the meanings as defined in the description in the presence of a catalyst comprising at least one m-valent metal cation M m+ wherein the metal M is selected from Scandium (Sc), Yttrium (Y), Lanthanum (La), Cerium (Ce), Praseodymium (Pr), Neodymium (Nd), Promethium (Pm), Samarium (Sm), Europium (Eu), Gadolinium 15 (Gd), Terbium (Tb), Dysprosium (Dy), Holmium (Ho), Erbium (Er), Thulium (Tm), Ytterbium (Yb), Lutetium (Lu), Gallium (Ga) and Indium (In), and m is an integer of 1, 2 or 3, and a chiral ligand of the formula (IV) wherein R 10a , R 10b , R 10c , R 10d , R 10a′ , R 10b′ , R 10c′ , R 10d′ , Z and Z′ have the meanings as defined in the description.

专利号:US-10995049-B2
优先权日:2019-07-19
标 题 :Total synthesis of prostaglandin J natural products and their intermediates
发明人：LI JIAMING; XU CHEN; AHMED TONIA S; GRUBBS ROBERT H; STOLTZ BRIAN M
权利人:CALIFORNIA INST OF TECHN
摘要:The present disclosure is directed to methods of preparing prostaglandin J natural products by stereoretentive metatheses reactions and intermediates used in the synthesis of these natural products, including the use of intermediates of Formula (I-A), where R 1 is defined in the specification

专利号:WO-2010103857-A1
优先权日:2009-03-12
标 题 :Method for solid-phase synthesis of glycopeptide using silicon-containing protecting group and synthesis device
发明人：NISHIMURA SHIN-ICHIRO; SHIMAWAKI KEN
权利人:UNIV HOKKAIDO NAT UNIV CORP; NISHIMURA SHIN-ICHIRO; SHIMAWAKI KEN
摘要:Disclosed are a novel method for the synthesis of a glycopeptide by which glycopeptides of various types can be deprotected and excised from a resin, each under weakly acidic to weakly basic conditions, without causing the problems of the epimerization of an amino acid at the a-position and the ß-elimination of a sugar residue; a synthesis device therefor; and a synthesis intermediate to be used in synthesizing a glycopeptide. Specifically disclosed are a method for the solid-phase synthesis of a glycopeptide which comprises a step for obtaining a glycopeptide derivative wherein the N-terminus is protected, the C-terminus is immobilized to a solid phase via a silicon linker, and a reactive group carried by a sugar residue and a reactive group carried by an amino acid side chain constituting a peptide are protected by silicon-containing groups, and a step for obtaining the glycopeptide by deprotecting said glycopeptide derivative and releasing the same from the solid phase by treating the glycopeptide derivative with an agent for removing the silicon-containing groups and the silicon linker; a synthesis intermediate to be used in the step for obtaining the glycopeptide derivative in the aforesaid method; and a device for the solid-phase synthesis of a glycopeptide.

专利号:US-8138330-B2
优先权日:2006-09-11
标 题 :Process for the synthesis of oligonucleotides
发明人：LEUCK MICHAEL; WOLTER ANDREAS; STUMPE ALFRED
权利人:LEUCK MICHAEL; WOLTER ANDREAS; STUMPE ALFRED; SIGMA ALDRICH CO LLC
摘要:The present invention discloses novel methods for the synthesis of oligonucleotides with nucleoside phosphoramidites on solid supports. The methods comprise the stepwise chain assembly of oligonucleotides on supports with 5′-acyl phosphoramidites. The synthesis cycles consist of a front end deprotection step which is conducted with a solution of a primary amine or a phenolate, a phosphoramidite coupling step with a 5′-acyl nucleoside phosphoramidite in the presence of an activator, a phosphite oxidation step and an optional capping step. The novel methods improve the quality of synthetic oligonucleotides due to the irreversibility of the front end deprotection step, which prevents the formation of deletion sequences, and due to the avoidance of acidic reagents in the synthesis cycles, which prevent the formation of depurination side products. The invention further discloses novel nucleoside phosphoramidite compositions wherein the phosphoramidites carry acyl front end protective groups which are cleavable with primary amines or phenolates. The invention is applicable to the synthesis of oligodeoxyribonucleotides, oligoribonucleotides and oligonucleotides with modifications in their sugar or phosphate groups.

专利号:US-5936080-A
优先权日:1996-05-24
标题 :Compositions and methods for the synthesis of organophosphorus derivatives
发明人：STEC WOJCIECH J; WOZNIAK LUCYNA
权利人:GENTA INC; POLSKA AKADEMIA NAUK INSTYTUT
摘要:New organophosphorus mononucleoside derivatives, methods of their synthesis and methods for the synthesis of organophosphorus dinucleotide derivatives utilizing the organophosphorus mononucleosides are provided. Synthesized organophosphorus mononucleoside derivatives of the present invention are characterized by the formula; ##STR1## Organophosphorus dinucleoside derivatives prepared from the synthesis methods provided in the present invention are characterized by the formula; ##STR2##

专利号:US-2024287520-A1
优先权日:2021-06-30
标题:Method for synthesis of linkage modified oligomeric compounds
发明人：RODRIGUEZ ANDREW A
权利人:IONIS PHARMACEUTICALS INC
摘要:The present disclosure provides methods of synthesizing modified oligonucletodies and oligomeric compounds (including oligomeric compounds that are antisense agents or portions thereof) comprising a modified oligonucleotide having at least one modified internucleoside linking group. In certain embodiments, the present disclosure provides stabilized formulations of certain sulfonyl azides for use in the synthesis of olignonucleotides comprising one or more sulfonyl phosphoramidate linkages. Some embodiments provide stabilized compositions of high energy reagents that may be used in the synthesis of modified oligonucleotides, allowing for safe process scale preparation thereof.