74285-41-9Relevant articles and documents
Synthesis of Polysubstituted Meta-Halophenols by Anion-Accelerated 2π-Electrocyclic Ring Opening
Staudt, Markus,S?lling, Theis,Bunch, Lennart
, p. 10941 - 10947 (2021)
Disrotatory – thermally allowed – 2π-electrocyclic ring-opening reactions require high temperatures to proceed. Herein, we report the first anion-accelerated 2π-electrocyclic ring opening of 6,6-dihalobicyclo[3.1.0]hexan-2-ones at low temperature to give the corresponding meta-halophenols in good to high yields (18 examples, 29–92 % yield, average: 65 %). Many of the phenols have unconventional substitution patterns and are reported here for the first time. Furthermore, the strength of the methodology was shown by the total synthesis of the densely functionalized phenolic natural product caramboxin (isolated as the lactam dehydrate). The reaction mechanism underlying the anion-acceleration was investigated in an ab initio study, which concluded that base-mediated proton abstraction anti to the concurrently departing endo-bromine was the initiating step in an overall concerted reaction mechanism leading directly to the meta-halophenol.
Synthesis of Isolaurene and Its Related Compounds from Cyclotene
Tonari, Kennosuke,Ichimoto, Itsuo,Ueda, Hiroo
, p. 625 - 630 (2007/10/02)
Novel syntheses of isolaurene (1), an isomer of laurene (2) found in algae, and its related compounds were performed from cyclotene (3).Benzylated cyclotene (4) was allowed to react with p-tolyl-magnesium bromide to give 5-methyl-2-p-tolyl-2-cyclopentenon
