Generation of Diarylcarbenium Ion Pools via Electrochemical C–H Bond Dissociation
作者:Masayuki Okajima、Kazuya Soga、Takashi Watanabe、Kimitada Terao、Toshiki Nokami、Seiji Suga、Jun-ichi Yoshida
DOI:10.1246/bcsj.82.594
日期:2009.5.15
The “cation pools” of diarylcarbenium ions have been generated by the low-temperature electrochemical oxidation of diphenylmethane derivatives. In addition to diphenylmethanes having various substituents, 9,10-dihydroanthracene, dibenzosuberane, and xanthenes, which are annulated derivatives of diphenylmethane were also found to serve as a precursor of cation pools. The generation of the diarylcarbenium ion was confirmed by low-temperature NMR analysis and cold-spray mass analysis. Reactivity was also investigated by reactions with various carbon nucleophiles such as allyltrimethylsilane, 1,3,5-trimethylbenzene, and anisole.
作者:Masayuki Okajima、Kazuya Soga、Toshiki Nokami、Seiji Suga、Jun-ichi Yoshida
DOI:10.1021/ol061647c
日期:2006.10.1
"Cation pools" of diarylcarbenium ions have been generated by the oxidative C-H bond dissociation of diarylmethanes using anodic oxidation. "Diarylcarbenium ion pools" thus generated react with various nucleophiles, such as allylsilanes, ketene silyl acetals, and aromatic compounds. The reductive homocoupling of the "diarylcarbenium ion pool" has been achieved. The dimer thus obtained also serves as
Facile Direct Coupling Reactions of
<scp>MOM</scp>
‐protected Benzylic Alcohols Using Aluminum Chloride
作者:Tien Tan Bui、Hee‐Kwon Kim
DOI:10.1002/bkcs.12358
日期:2021.9
used protecting groups for alcohols. This study describes novel direct functionalization of the MOM-protected benzylic alcohols. Preparation of allylic compounds from benzyl MOM ethers was successfully achieved by utilization of allyltrimethylsilane and AlCl3. In addition, direct azidation of benzyl MOM ethers using TMSN3 was successful carried out under AlCl3-mediated reaction conditions. These results
Carbon-Based Leaving Group in Substitution Reactions: Functionalization of sp<sup>3</sup>-Hybridized Quaternary and Tertiary Benzylic Carbon Centers
作者:Stuart J. Mahoney、Tiantong Lou、Ganna Bondarenko、Eric Fillion
DOI:10.1021/ol301442z
日期:2012.7.6
Lewis acid promoted substitution reactions employing Meldrum’s acid and 5-methyl Meldrum’s acid as carbon-based leavinggroups are described which transform unstrained quaternary and tertiary benzylic Csp3–Csp3 bonds into Csp3–X bonds (X = C, H, N). Importantly, this reaction has a broad scope in terms of both suitable substrates and nucleophiles with good to excellent yields obtained (typically >90%)