An efficient synthesis of β-amino esters via Zn(OTf)2-catalyzed Mannich-type reaction
作者:Wang-Ge Shou、Yun-Yun Yang、Yan-Guang Wang
DOI:10.1016/j.tetlet.2005.12.136
日期:2006.3
A Zn(OTf)2-catalyzed Mannich-typereaction of the electron-deficient aromatic amines with the electron-deficient aromatic aldehydes and diethyl malonic ester was described. This three-component reaction afforded the corresponding β-amino esters in good yields.
Triazolines XIII: Δ2-1,2,3-Triazolines, a New Class ofAnticonvulsants
作者:Pankaja K. Kadaba
DOI:10.1002/jps.2600730642
日期:1984.6
synthesized and evaluated for the first time as potential anticonvulsant agents using the standard subcutaneous pentylenetetrazol seizure threshold and maximal electroshock seizure tests. Out of the 31 triazolines that were screened, 11 exhibited moderate anticonvulsant activity; 9 of the compounds afforded protection against pentylenetetrazol-induced seizures, while two antagonized electrically induced convulsions
The reaction of imines 1 with 5,5-dimethyl-1,3-cyclohexandione 2 in methanol was investigated. When the reaction was carried out without a catalytic amount of molecular iodine, ring-opening derivatives of xanthenediones 3 were obtained in high yields. On the other hand, when molecular iodine and a catalytic amount of zinc powder were employed as the catalyst, xanthenediones derivatives 4 were obtained with excellent yields.
Mayer,F.; Levis, Chemische Berichte, 1919, vol. 52, p. 1647
作者:Mayer,F.、Levis
DOI:——
日期:——
Efficient, Solvent-Free, Microwave-Enhanced Condensation of 5,5-Dimethyl-1,3-cyclohexanedione with Aldehydes and Imines Using LiBr as Inexpensive, Mild Catalyst
作者:Dhruva Kumar、Jagir S. Sandhu
DOI:10.1080/00397910902987792
日期:2010.2.2
Efficient, solvent-free, microwave-enhanced condensation of 5,5-dimethyl-1,3-cyclohexanedione with aldehydes using LiBr as catalyst affords xanthenediones. Imines gave only bis-5,5-dimethyl-1,3-cyclohexanediones at high power; a slightly longer period gave xanthenediones. In both types of reactions, the products are obtained in very good to excellent yields. The present protocol is inexpensive and ecofriendly.