Reactions of Cp2TiMe2 with ferrocene and (ɳ5-Cp)Co(ɳ4-C4Ph4) derived esters and amides: A new route for 1-methylvinyl and methyl ketone derived metal sandwich compounds
作者:Jatinder Singh、Sanjib Ghosh、Mayukh Deb、Anil J. Elias
DOI:10.1016/j.jorganchem.2016.05.024
日期:2016.9
extended to metal sandwich derivedamides, thio and seleno esters. By controlling the amount of Cp2TiMe2, the reactions were also stopped at the methyl ketone stage and the methyl ketones were isolated in good yields and characterized. The method provides an easy and direct access to convert organometallic sandwich derived esters and related compounds to 1-methylvinyl derived products.
Cp的反应2时间2,与有机金属化合物三明治的酯衍生物(ɳ 5 -RC 5 H ^ 4)的Fe(ɳ 5 -C 5 H ^ 5)和(ɳ 5 -RC 5 H ^ 4)的Co(ɳ 4 -C 4 Ph 4)(R =酯基)得到具有R = C(CH 2)Me的产物,而不是预期的乙烯基醚,表明Cp 2 TiMe 2将酯单元转化为甲基酮,然后进行甲基化。Cp 2 TiMe 2的反应与二酯(ɳ 5 -RC 5 H ^ 4)的Co(ɳ 4 -C 4博士3 R)(R C(O)OME)也得到相似的结果。该研究也已成功地扩展到金属夹心衍生的酰胺,硫代和硒代酯。通过控制Cp 2 TiMe 2的量,反应也停止在甲基酮阶段,并以高收率分离出甲基酮并进行表征。该方法提供了将有机金属夹心衍生的酯和相关化合物转化为1-甲基乙烯基衍生的产物的容易且直接的途径。
Gold catalysed reactions with cyclopropenes
作者:Jürgen T. Bauer、Maximillian S. Hadfield、Ai-Lan Lee
DOI:10.1039/b815891f
日期:——
Gold(I) catalyses the ring-opening addition of cyclopropenes in a mild and regioselective manner.
1-Fluoroindan-1-carboxylic acid (FICA) (1) was designed and synthesized as its methyl ester (FICA Me ester) (4) in order to develop an efficient chiral derivatizing agent (CDA) which excels α-methoxy-α-(trifluoromethyl)phenylacetic acid (MTPA) in capability. FICA Me ester (4) was prepared by fluorination of methyl 1-hydroxyindan-1-carboxylate (3) with (diethylamino)sulfurtrifluoride (DAST) and derived to the
为了开发出一种优于α-甲氧基-α-的高效手性衍生剂(CDA),设计并合成了1-氟罗丹丹-1-羧酸(FICA)(1)作为其甲酯(FICA Me酯)(4)。 (三氟甲基)苯乙酸(MTPA)的能力。通过用(二乙基氨基)三氟化硫(DAST)氟化1-羟基茚满-1-羧酸甲酯(3)来制备FICA Me酯(4),并通过酯交换反应将其衍生为外消旋仲醇的酯。将所得的Δ δ ˚F值在FICA(2-丁基酯的情况下大图5a),而在相应的MTPA酯(的情况下不可检测的图6a)。Δ的大小δ ħ值是相似的MTPA酯。分离了FICA(5i)的(R)-(-)-8-苯基薄荷基酯的非对映异构体,并通过1 H NMR分析表明,改进的Mosher方法的概念已成功应用于5i。
cyclohexene-1-carboxylate (I) and methyl indene-3-carboxylate (III) with trialkyltin hydrides, R3SnH (R Me, n-Bu, Ph) gives the energetically unfavourable cis products, 2-trialkylstannyl cyclohexanecarboxylate (II) and 2-trialkylstannyl indane-1-carboxylate (IV) in high yields, via a trans addition of the tin hydrides. The hydride abstractions by the intermediate trialkylstannylcyclohexanyl (VIII) and trialkylstannylindanyl
氢化三烷基锡R 3 SnH(R -3- Me,n-Bu,Ph)对环己烯-1-羧酸甲酯(I)和茚三羧酸甲酯(III)的自由基氢化作用产生了在能量上不利的顺式产物2-经由反式,高收率的三烷基锡烷基环己烷羧酸酯(II)和2-三烷基锡烷基茚满-1-羧酸酯(IV)添加氢化锡。中间体三烷基锡烷基环己基(VIII)和三烷基锡烷基林丹基(IX)中间基团对氢化物的提取是立体定向的,并且仅从受阻较小的环侧进行。异构体II和IV的结构是通过(a)将其转化为相应的氯二烷基锡烷基衍生物V和VI来确定的,在光谱上通过酯基的分子内络合显示其具有顺式立体化学,以及(b)其NMR数据。给出了全部1 H,13 C和119 Sn NMR数据。
[EN] 3-HYDROXY-4-OXO-1,2,3-TRIAZINES AND DERIVATIVES THEREOF FOR AMIDE AND ESTER BOND FORMATION<br/>[FR] 3-HYDROXY-4-OXO-1,2,3-TRIAZINES ET LEURS DERIVES POUR LA FORMATION DE LIAISONS AMIDE ET ESTER
申请人:FRUTAROM LTD
公开号:WO2005007634A1
公开(公告)日:2005-01-27
The present invention relates to the use of a compound of formula I as a coupling reagent in forming amide or ester bonds from a reaction between a carboxylic acid and an amine or an alcohol, respectively. The compounds of formula I are especially useful as coupling reagents in the preparation of peptide bonds during peptide synthesis. In particular, the compounds of formula I are useful in promoting the formation of reactive reaction intermediates, inhibiting side reactions and in suppression of racemization. In addition, the present invention provides novel compounds of Formula I, and salts of N-oxides thereof.