Aniline mediated oxidative C–C bond cleavage of α-alkoxy aldehydes in air and a model reaction for the synthesis of α-(d)-amino acid derivatives
作者:Bin Hu、Yunfeng Li、Zhongjun Li、Xiangbao Meng
DOI:10.1039/c3ob40685g
日期:——
4-methyl aniline mediated method for the oxidativeC–C bond cleavage has been developed. The reaction proceeds in airusing molecular oxygen as the oxidant, affording one-carbon shortened esters in moderate to good yields within a short time. Moreover, it provides a model reaction for the highly enantioselective synthesis of (D)-serine esters by combining with a L-proline catalyzed Mannich reaction.
A Brønsted Acid Catalyzed Cascade Reaction for the Conversion of Indoles to α‐(3‐Indolyl) Ketones by Using 2‐Benzyloxy Aldehydes
作者:Ankush Banerjee、Modhu Sudan Maji
DOI:10.1002/chem.201902268
日期:2019.9.2
A Brønstedacid catalyzed, operationally simple, scalable route to several functionalized α-(3-indolyl) ketones has been developed and the long-standing regioisomeric issue has been eliminated by choosing appropriate carbonyls. A readily available and cheap bottle reagent was used as the catalyst. This protocol was also applicable to the synthesis of densely functionalized α-(3-pyrrolyl) ketones. A
Nickel-catalyzed reductive coupling of unactivated alkyl bromides and aliphatic aldehydes
作者:Cole L. Cruz、John Montgomery
DOI:10.1039/d1sc03712a
日期:——
A mild, convenient coupling of aliphaticaldehydes and unactivated alkyl bromides has been developed. The catalytic system features the use of a common Ni(II) precatalyst and a readily available bioxazoline ligand and affords silyl-protected secondary alcohols. The reaction is operationally simple, utilizing Mn as a stoichiometric reductant, and tolerates a wide range of functional groups. The use
已开发出一种温和、方便的脂肪醛和未活化烷基溴的偶联方法。该催化系统使用常见的 Ni( II ) 预催化剂和易于获得的生物恶唑啉配体,并提供甲硅烷基保护的仲醇。该反应操作简单,使用 Mn 作为化学计量还原剂,并且可以耐受多种官能团。使用 1,5-己二烯作为添加剂是一个重要的反应参数,可显着提高产量。最初的机械实验支持一种以 α-甲硅烷氧基镍物种为特征的机制,该物种通过还原性交叉偶联途径对烷基溴进行正式氧化加成。
Kinetic Resolution of 1,1′-Biaryl-2,2′-Diols and Amino Alcohols through NHC-Catalyzed Atroposelective Acylation
作者:Shenci Lu、Si Bei Poh、Yu Zhao
DOI:10.1002/anie.201406192
日期:2014.10.6
We present here a highly efficient NHC‐catalyzedkineticresolution of a wide range of 1,1′‐biaryl‐2,2′‐diols and amino alcohols to provide them in uniformly ≥99 % ee. This represents the first highly enantioselective catalytic acylation of axially chiral alcohols. The aldehyde backbone that is incorporated into the chiral acyl azolium intermediate was found to have a significant effect on the enantioselectivity
Compounds for a controlled release of active molecules
申请人:——
公开号:US20040220074A1
公开(公告)日:2004-11-04
The present invention relates to the field of perfumery. More particularly, it concerns compounds comprising at least one &bgr;-oxy or &bgr;-thio carbonyl moiety capable of liberating a perfuming molecule such as, for example, an &agr;,&bgr;-unsaturated ketone, aldehyde or carboxylic ester. The present invention concerns also the use of the compounds in perfumery as well as the perfuming compositions or perfumed articles comprising the invention's compounds.