Synthesis of functionalized hydroxyphthalides and their conversion to 3-cyano-1(3H)-isobenzofuranones. The Diels-Alder reaction of methyl 4,4-diethoxybutynoate and cyclohexadienes
There is provided compounds of formula I,
wherein R
1
to R
7
have meanings given in the description, which are useful in the prophylaxis and in the treatment of arrhythmias, in particular atrial and ventricular arrhythmias.
Synthesis of unnatural α-amino esters using ethyl nitroacetate and condensation or cycloaddition reactions
作者:Glwadys Gagnot、Vincent Hervin、Eloi P Coutant、Sarah Desmons、Racha Baatallah、Victor Monnot、Yves L Janin
DOI:10.3762/bjoc.14.263
日期:——
We report here on the use of ethyl nitroacetate as a glycine template to produce α-amino esters. This started with a study of its condensation with various arylacetals to give ethyl 3-aryl-2-nitroacrylates followed by a reduction (NaBH4 and then zinc/HCl) into α-amino esters. The scope of this method was explored as well as an alternative with arylacylals instead. We also focused on various [2 + 3]
The substituent parameters for the series of mono-, di- and trisubstituted Me groups, CH2X, CHX2, and CX3 where X is F, Cl, Br, OMe, SCF3 and CN, have been determined from F19 NMR measurements on the corresponding meta- and para-fluorotoluenes. An additive linear effect of substitution is found only for the cyano substituent. A saturation effect noted for the groups where X is F, Cl, Br and SCF3 (particularly