使用衍生自稳定的螺硼酸酯,通过硼烷介导的单一异构体 ( E )- 和 ( Z ) -O-苄基肟醚的还原,合成了高对映体纯的 (1-芳基)-和 (1-萘基)-1-乙胺( S )-二苯基缬氨醇和乙二醇作为手性催化剂。伯 ( R )-芳基乙胺是通过使用 15% 的催化剂将纯 ( Z )-乙酮肟醚还原至 99% ee来制备的。描述了使用对映纯(1-萘-1-基)乙胺作为手性前体合成新的和已知的拟钙剂类似物的两种方便且容易的方法。
使用衍生自稳定的螺硼酸酯,通过硼烷介导的单一异构体 ( E )- 和 ( Z ) -O-苄基肟醚的还原,合成了高对映体纯的 (1-芳基)-和 (1-萘基)-1-乙胺( S )-二苯基缬氨醇和乙二醇作为手性催化剂。伯 ( R )-芳基乙胺是通过使用 15% 的催化剂将纯 ( Z )-乙酮肟醚还原至 99% ee来制备的。描述了使用对映纯(1-萘-1-基)乙胺作为手性前体合成新的和已知的拟钙剂类似物的两种方便且容易的方法。
of E- and Z-α-aminoacetophenone oximes depending on the solvent used. Assignment of configuration can be achieved by 13C NMR spectroscopy even if only one isomer is available using a strong solvent dependence of the methylene chemical shift in the case of the Z-isomers. This effect is due to the presence of different conformations in the solvents chloroform and dimethyl sulfoxide. Together with a study
Z-α-卤代苯乙酮肟的氨解反应会导致E-和Z-α-氨基苯乙酮肟的混合物不同,具体取决于所使用的溶剂。即使在Z-异构体的情况下,即使仅一种异构体在对亚甲基化学位移的强烈溶剂依赖性下可用,也可以通过13 C NMR光谱法实现构型分配。该效果是由于在溶剂氯仿和二甲基亚砜中存在不同的构型。结合蒸汽渗透压法的研究,结果为氯仿中Z-α-氨基苯乙酮肟的分子内氢键提供了明确的证据。
Synthesis of Highly Substituted Pyrroles via Nucleophilic Catalysis
作者:Simbarashe Ngwerume、Jason E. Camp
DOI:10.1021/jo1011448
日期:2010.9.17
tri-, and tetrasubstituted pyrroles is described. This regioselective one-pot method relies on nucleophilic catalysis of the intermolecular addition of oximes to activated alkynes and thermalrearrangement of the in situ generated O-vinyl oximes to form pyrroles that contain a functional group handle at the C3/C4 position.
On the mechanism of the decarboxylative rearrangement of thiohydroxamic esters
作者:Derek H.R. Barton、David Crich、Paierre Potier
DOI:10.1016/s0040-4039(00)98267-4
日期:1985.1
The thermal and photochemical decomposition of a typical thiohydroxamic ester (mixedanhydride) doubly labelled with deuterium has shown the photochemical reaction to be a radical chain process, whereas about 20% of the thermal reaction involves a cage mechanism. An improved route to 1-hydroxy-5-phenylthiazolin- -2-thione is reported.
SYNTHESIS OF IMIDAZOLE DERIVATIVES FROM α-HALOOXIMES AND AMIDINES BY USE OF IRON CARBONYLS
作者:Saburo Nakanishi、Junji Nantaku、Yoshio Otsuji
DOI:10.1246/cl.1983.341
日期:1983.3.5
The reaction of α-halooximes with amidines in the presence of iron carbonyls gives imidazole derivatives in good yields. This reaction occurs via deoxygenation of 4H-1,2,5-oxadiazines by iron carbonyls.
Synthesis of 1,2,3-Triazolyl-Based Ketoximes Using Calcium Carbide as an Acetylene Source
作者:Hao Lu、Zheng Li
DOI:10.1002/ejoc.201901712
日期:2020.2.21
Calciumcarbide: A novel method for the synthesis of 1,2,3‐triazolyl‐based ketoximes by using readily available calciumcarbide as an acetylene source, (Z)‐2‐azido‐1‐arylethan‐1‐one oximes as starting materials and copper(I) chloride as a catalyst is described.