Synthesis of Polysubstituted Meta-Halophenols by Anion-Accelerated 2π-Electrocyclic Ring-Opening
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Synthesis of Polysubstituted Meta-Halophenols by Anion-Accelerated 2π-Electrocyclic Ring-Opening. / Staudt, Markus; Sølling, Theis Ivan; Bunch, Lennart.
In: Chemistry - A European Journal, Vol. 27, No. 42, 2021, p. 10941–10947.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Synthesis of Polysubstituted Meta-Halophenols by Anion-Accelerated 2π-Electrocyclic Ring-Opening
AU - Staudt, Markus
AU - Sølling, Theis Ivan
AU - Bunch, Lennart
PY - 2021
Y1 - 2021
N2 - 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.
AB - 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.
U2 - 10.1002/chem.202100939
DO - 10.1002/chem.202100939
M3 - Journal article
C2 - 34041800
VL - 27
SP - 10941
EP - 10947
JO - Chemistry: A European Journal
JF - Chemistry: A European Journal
SN - 0947-6539
IS - 42
ER -
ID: 269518180