novel semipinacol rearrangement using dibromocyclopropanes as sources of carbocations was developed. Heating dibromocyclopropanes bearing a 1‐hydroxyalkyl group with silver perchlorate and 2,6‐lutidine induced cleavage of the cyclopropane ring to form allyl cations, which underwent 1,2‐shift of a substituent at the α‐position of the hydroxygroup to give β,γ‐unsaturated carbonylcompounds having a quaternary
Divergent Synthesis of Trifluoromethyl Sulfoxides and β-SCF<sub>3</sub> Carbonyl Compounds by Tandem Trifluoromethylthiolation/Rearrangement of Allylic and Propargylic Alcohols
A selenium-catalyzed trifluoromethylthiolation/[2,3]-sigmatropic rearrangement of tertiary allylic and propargylic alcohols which could provide straightforward and facile access to trifluoromethyl sulfoxides was developed. Various allylic and allenic trifluoromethyl sulfoxides were obtained with moderate to excellent yields. Meanwhile, a Lewis acid mediated trifluoromethylthiolation/1,2-rearrangement
Selenium-Catalyzed Trifluoromethylsulfinylation/Rearrangement of Allylic and Propargylic Alcohols: Access to Allylic and Allenic Triflones
作者:Deng Zhu、Hui-Yun Luo、Zhi-Min Chen
DOI:10.1021/acs.orglett.0c04236
日期:2021.2.5
A selenium-catalyzed trifluoromethylsulfinylation/rearrangement of allylic and propargylic alcohols for synthesizing triflones was developed for the first time. Various allylic and allenic triflones were delivered in moderate to excellent yields. After numerous control experiments were performed, it was suggested that this transformation includes an unusual [+SCF3] group disproportionation process
electrophilic thiocyano semipinacolrearrangement of allylic alcohols has been achieved for the first time by using N-thiocyano-dibenzenesulfonimide (NTSI). This approach provides a direct, simple, and efficient strategy for the formation of thiocyano carbonyl compounds with moderate to excellent yields. Meanwhile, an all-carbon quaternary center was rapidly constructed. In addition, an asymmetric version of this
Phosphazene base-promoted functionalization of aryltrimethylsilanes
作者:Koichi Suzawa、Masahiro Ueno、Andrew E. H. Wheatley、Yoshinori Kondo
DOI:10.1039/b611090h
日期:——
The activation of Ar–Si bonds in aryltrimethylsilane was investigated using a catalytic amount of t-Bu-P4 base and selective functionalizations of aryltrimethylsilanes in the absence of strong electron withdrawing groups on the aromatic rings were accomplished.