om0c00163_si_002.xyz (14.29 kB)
Download file[2 + 2] Cycloaddition of o‑Carboryne with Vinyl Ethers: Synthesis of Carborane-Fused Cyclobutanes
dataset
posted on 2020-04-22, 19:53 authored by Jie Zhang, Zuowei Xieo-Carboryne (1,2-dehydro-o-carborane)
is a very
useful synthon for the synthesis of a variety of carborane-functionalized
molecules. Using 1-Li-2-OTf-o-C2B10H10 as a precursor, o-carboryne
undergoes an efficient [2 + 2] cycloaddition with a large variety
of vinyl ethers at room temperature to give a series of carborane-fused
cyclobutanes in very good to high isolated yields. This reaction is
compatible with many functional groups and has a very broad substrate
scope ranging from alkyl- to aryl- and to silyl-substituted vinyl
ethers. A stepwise reaction mechanism is proposed based on the control
experiments, which is supported by DFT calculations. All new compounds
have been fully characterized by 1H, 13C, and 11B NMR spectroscopy as well as HRMS spectrometry. Some are
further confirmed by single-crystal X-ray analyses.
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Keywords
C 2 B 10 H 10seriescompounddehydro-o-carboraneHRMS spectrometry11 B NMR spectroscopycarborane-fused cyclobutanescontrol experimentscycloadditionsubstrate scopevarietyCycloadditionCarborynesingle-crystal X-ray analysesCarborane-Fused CyclobutanessynthesissynthonDFT calculations13 Ccarborane-functionalized molecules1 Hcarboryne1- Li -2-OTfVinyl Ethersprecursorsilyl-substituted vinyl ethersvinyl ethersreaction mechanismyieldalkylroom temperaturearylSynthesi