N-heterocyclic carbene-catalyzed intramolecular aza-Michael addition of alkyl amines to α,β-unsaturated carboxylic acid: Synthesis of pyrrolidines and piperidines
作者:Zhao-Fei Zhang、Zhong-Hua Gao、Chun-Lin Zhang、Song Ye
DOI:10.1016/j.tet.2021.132337
日期:2021.8
carbene-catalyzed intramolecular aza-Michael addition of alkyl amines to α,β-unsaturatedcarboxylicacid has been realized. The corresponding pyrrolidine and piperidine derivatives can be obtained in good to excellent yields. Reaction using chiral NHC catalyst showed promising enantioselectivities up to 55% ee. Further chemical transformations of the products provided carboxylicacids, alcohols, and unprotected
N-杂环卡宾催化烷基胺与α,β-不饱和羧酸的分子内氮杂-迈克尔加成反应已经实现。相应的吡咯烷和哌啶衍生物可以以良好到极好的收率获得。使用手性 NHC 催化剂的反应显示出高达 55% ee 的对映选择性。产物的进一步化学转化提供了羧酸、醇和未保护的胺。
Thermische Umwandlung von Penta-2, 4-dienyl-phenyläthern in 4-(Penta-2, 4-dienyl)-phenole; [5s, 5s]-sigmatropische Umlagerungen
作者:Gy. Fráter、H. Schmid
DOI:10.1002/hlca.19700530208
日期:——
trans-Penta-2, 4-dienyl phenyl ether (trans-1), on heating at 186° in a five-fold excess of N, N-diethylaniline, gave via a [3s, 3s] rearrangement 23% of 2-(1-vinyl-allyl)-phenol (2) and via a [5s, 5s] rearrangement 37% of trans-4-(penta-2, 4-dienyl)-phenol (trans-3). The dimeric residue was formed from trans-1 by diene synthesis. By working at high dilution, the formation of dimeric products was kept
Synthesis of hexakis(aryloxy)benzenes: x-ray analysis of hexakis (phenyloxy) benzene and of the acetonitrile clathrate of hexakis (3,5-dimethylphenyloxy) benzene
作者:Christopher J. Gilmore、David D. MacNicol、Anthony Murphy、Marie A. Russell
DOI:10.1016/s0040-4039(00)88154-x
日期:1983.1
Hexakis (aryloxy) benzenes (I)-(IV), representatives of a new class of molecule, have been prepared by reaction of hexafluorobenzene with the sodium salt of the appropriate phenol in 1,3-dimethyl-2-imidazolidinone (DMEU) as solvent. X-ray analyses of parent (I) and of the acetonitrile clathrate of (II) are described, a novel edge-on interaction between host and guest being found in the latter.
We prepared a series of N-aryl isoxazolecarboxamide, N-isoxazolylbenzamide compounds and derivatives and studied their anticonvulsant action in MES and MMS tests. Some of these reveal considerable activity, especially with respect to MES test. The disubstitution in the 2.6-position on the phenyl ring by two methyl groups would appear to be of primary importance for the activity. The amide bridge between the phenyl and isoxazolic rings, whether of the anilide or benzamide type, seems to show similar anticonvulsant behavior. We have selected the derivatives 8 (N-(2.6-dimethylphenyl)-5-methyl-3-isoxazolecarboxamide, 12 (N-(2,6-dimethylphenyl)-5-hydroxymethyl-3-isoxazolecarboxamide) and 51 (N-(5-methyl-3-isoxazolyl)-2.6-dimethylbenzamide) which are presently being studied in more extended pharmacological tests.
Jentzsch,R. et al., Journal fur praktische Chemie (Leipzig 1954), 1977, vol. 319, p. 862 - 870