solution lead to a mixture of o- and p-Bn-substituted phenols together with a substantial amount of phenol Bn ether. In CPME, and especially in toluene with 1–2 equivalents of ether or alcohol additives, ortho-selective alkylation is achieved. In the case of o,o,p-tri- and o,o-di-substituted phenols dearomatization occurs affording o-Bn-substituted alkyl cyclohexadienones with yields up to 92% with an o/p
The stereochemistry of 2-benzalcyclohexanones and 2-benzalcyclopentanones
作者:A. Hassner、T.C. Mead
DOI:10.1016/s0040-4020(01)97605-7
日期:1964.1
trans-2-Benzal-6-methylcyclohexanone (III) and trans-2-benzal-5-methylcyclopentanone (VII) isomerize in the presence of acid to the endocyclic unsaturated isomers 2-benzyl-6-methyl-2-cyclohexenone (II) and 2-benzyl-5-methyl-2-cyclopentenone (VI) respectively. Structure proof and chemical conversions of II are described. Isomerization of III to its cis isomer IV was accomplished by light irradiation
Synthesis of Highly Substituted Phenols and Benzenes with Complete Regiochemical Control
作者:Xiaojie Zhang、Christopher M. Beaudry
DOI:10.1021/acs.orglett.0c02157
日期:2020.8.7
Substitutedphenols are requisite molecules for human health, agriculture, and diverse synthetic materials. We report a chemical synthesis of phenols, including penta-substituted phenols, that accommodates programmable substitution at any position. This method uses a one-step conversion of readily available hydroxypyrone and nitroalkene starting materials to give phenols with complete regiochemical
containing an acyloxy substituent at the propargylic position gave highly substituted phenols in good yields (see scheme). Depending on the structure of the silyl enol ether, either nucleophilic addition of this moiety or 1,2‐acyloxy migration occurs to give two kinds of synthetically useful, substituted phenols.