Selectively functionalized resorcinarenes were obtained by weak-base-promoted O-alkylation of C-undecylresorcin[4]arene 1. Tetrasubstituted derivatives with C-4-1,3,5,7, C-2v-1 2,5,6, C-s-1,2,4,7, and C-1-1,2,4,6 pattern were obtained in workable yields by using K2CO3 as the base in acetone at reflux. The good regioselectivity with respect to the statistical distribution was explained in terms of preferential formation of H-bonded monoanions. Heptaaroylated resorcin[4]arenes were also easily obtained by reaction of 1 with aroyl chlorides in pyridine.
One-Step Synthesis of <i>C</i><sub>2v</sub>-Symmetric Resorcin[4]arene Tetraethers
作者:Jordan N. Smith、Thomasin K. Brind、Simon B. Petrie、Mikaela S. Grant、Nigel T. Lucas
DOI:10.1021/acs.joc.0c00128
日期:2020.3.20
The three-component reaction between a resorcinol, 1,3-dimethoxybenzene, and an alkyl aldehyde (R = C1-C11) along with BF3·OEt2 affords a C2v-symmetric resorcin[4]arenetetraether in one step; in most cases, the single isomer can be precipitated from the reaction mixture in moderate to excellent yields (up to 89%). The reaction is tolerant of 2-substituted resorcinols (R' = OH, Cl, Br, Me), allowing