Preparative synthesis of 2,2-dimethyl-5-(trifluoroacetyl)-1,3-dioxane-4,6-dione (2-trifluoroacetyl Meldrum's acid) and 2,2-dimethyl-6-(trifluoromethyl)-4H-1,3-dioxin-4-one and their synthetic usefulness as (trifluoroacetyl)ketene precursors
作者:Dmitri V. Sevenard、Andrey V. Didenko、Denis Lorenz、Michael Vorobiev、Johannes Stelten、Thomas Dülcks、Vyacheslav Ya. Sosnovskikh
DOI:10.1016/j.tet.2017.01.065
日期:2017.3
A simple and reliable method for the preparation of 2,2-dimethyl-5-(trifluoroacetyl)-1,3-dioxane-4,6-dione and 2,2-dimethyl-6-(trifluoromethyl)-4H-1,3-dioxin-4-one on a multigram scale was developed. These (trifluoroacetyl)ketene precursors were used in the hetero-Diels-Alder reaction with dialkylcyanamides and 1-ethoxyprop-1-yne, as well as in some reactions with nucleophiles.
一种简单可靠的制备2,2-二甲基-5-(三氟乙酰基)-1,3-二恶烷-4,6-二酮和2,2-二甲基-6-(三氟甲基)-4 H -1的方法,研制出了以克为单位的3-dioxin-4-one。这些(三氟乙酰基)乙烯酮前体用于与二烷基氰酰胺和1-乙氧基丙-1-炔的杂Diels-Alder反应中,以及与亲核试剂的某些反应中。