提出了在碱性条件下有效的,高区域选择性的将3-苯甲酰间苯二甲酸二甲酯二酯水解和酯交换成相应的羧酸单酯和混合酯(包括叔丁基酯)的方法。选择性由相邻的3-苯甲酰胺基部分的参与和溶剂的性质决定。在醇中,该反应仅发生在苯甲酰胺基官能团的邻位,在两个酯基的吡啶或乙腈中。通过在过氘代甲醇中的1 H NMR研究获得了对机理途径的见解。
Effect of Ring Size on the<i>Exo</i>/<i>Endo</i>Selectivity of a Thermal Double Cycloaddition of Fused Pyran-2-ones
作者:Kris̆tof Kranjc、Franc Perdih、Marijan Koc̆evar
DOI:10.1021/jo9011199
日期:2009.8.21
A study of an unusual effect of the size of the ring fused to 2H-pyran-2-ones on the exo/endo selectivity of a thermal double cycloaddition of N-substituted maleimides or maleic anhydride yielding bicyclo[2.2.2]octene derivatives is presented. With subtle variations of starting compounds and reaction conditions exclusively exo,exo or exo,endo products can be prepared.
AbstractEthyl vinyl ether was found to be an appropriate synthetic equivalent of acetylene for a set of Diels–Alderreactions with fused pyran-2-ones that yield fused carbocyclic systems. Transformations were conducted under microwave irradiation with DABCO (as a catalyst for the elimination of ethanol) and with n-butanol as the additive. A single-crystal X-ray diffraction structure is presented for
An efficient, highly regioselective hydrolysis and transesterification of dimethyl 3-benzamidophthalates into the corresponding carboxylic acid monoesters and mixed esters (including tert-butyl esters) under basic conditions is presented. The selectivity is governed by the neighboring 3-benzamido moiety’s participation and by the nature of the solvent. In alcohols the reaction occurred exclusively
提出了在碱性条件下有效的,高区域选择性的将3-苯甲酰间苯二甲酸二甲酯二酯水解和酯交换成相应的羧酸单酯和混合酯(包括叔丁基酯)的方法。选择性由相邻的3-苯甲酰胺基部分的参与和溶剂的性质决定。在醇中,该反应仅发生在苯甲酰胺基官能团的邻位,在两个酯基的吡啶或乙腈中。通过在过氘代甲醇中的1 H NMR研究获得了对机理途径的见解。