The disparate reaction pattern allowed the separate activation of non-ylidic S-alkyl and S-aryl bond. Under acidic conditions, sulfonium ylides serve as alkyl cation precursors which facilitate the alkylations. While under alkaline conditions, cleavage of non-ylidic S-aryl bond produces O-arylated compounds efficiently. The robustness of the protocols were established by the excellent compatibility of
Direct and Stereospecific Synthesis of
<i>N</i>
‐H and
<i>N</i>
‐Alkyl Aziridines from Unactivated Olefins Using Hydroxylamine‐
<i>O</i>
‐Sulfonic Acids
作者:Zhiwei Ma、Zhe Zhou、László Kürti
DOI:10.1002/anie.201705530
日期:2017.8.7
A RhII-catalyzed direct and stereospecific N-H- and N-alkyl aziridination of olefins is reported that uses hydroxylamine-O-sulfonic acids as inexpensive, readily available, and nitro group-free aminating reagents. Unactivated olefins, featuring a wide range of functional groups, are converted into the corresponding N-H or N-alkyl aziridines in good to excellent yields. This operationally simple, scalable
Glycosylation with 3,5-Dimethyl-4-(2′-phenylethynylphenyl)phenyl (EPP) Glycosides via a Dearomative Activation Mechanism
作者:Zhifei Hu、Yu Tang、Biao Yu
DOI:10.1021/jacs.9b00210
日期:2019.3.27
A highly effective and versatile glycosylation method is developed, which uses 3,5-dimethyl-4-(2'-phenylethynylphenyl)phenyl (EPP) glycosides as donors and NIS/TMSOTf as promoter and proceeds via an unprecedented dearomative activation mechanism.
strategically novel Pd-catalyzed nucleophilic addition induced allylic alkylation reaction (NAAA) of allenoates has been successfully accomplished. By judiciously integrating ZnCl2-promoted Michael addition with Pd-catalyzed allylic alkylation, allenoates readily undergo allyl-sunfonylation at the internaldoublebond, thus providing a straightforward avenue for the rapid assembly of a host of structurally
Silicon in synthesis: The use of trimethylsilyl cyanide for the synthesis of aliphatic cyanomethylethers
作者:James A. Schwindeman、Philip D. Magnus
DOI:10.1016/s0040-4039(01)92383-4
日期:1981.1
The conversion of aliphatic alcohols into cyanomethyl ethers treatment of methyl sulfoxymethyl ethers with trimethylsilylcyanide - zinc iodide is described.