YTTERBIUM METAL PROMOTED ALLYLATION OF DISULFIDES WITH ALLYL BROMIDE
摘要:
In the presence of a catalytic amount of methyliodide, ytterbium metal can promote the reductive cleavage of the S-S bond in disufides I to give ytterbium thiolates 2 which then react with allyl bromide to form the corresponding allylic sulfides 3 in good yields under mild and neutral conditions.
Rhodium-Catalyzed Denitrogenative [2,3] Sigmatropic Rearrangement: An Efficient Entry to Sulfur-Containing Quaternary Centers
作者:Dongari Yadagiri、Pazhamalai Anbarasan
DOI:10.1002/chem.201302653
日期:2013.11.4
blocks: α‐Sulfenylated imines containing a quaternary center, an ubiquitous subunit and excellent building block, were achieved by rhodium‐catalyzed denitrogenative [2,3] sigmatropic rearrangements of N‐sulfonyl‐1,2,3‐triazoles with allylaryl(alkyl) sulfides. Coupling of this methodology with a copper‐catalyzed cycloaddition reaction provides a platform for the direct regioselective functionalization of
Hemin Catalyzed Dealkylative Intercepted [2, 3]‐Sigmatropic Rearrangement Reactions of Sulfonium Ylides with 2, 2, 2‐Trifluorodiazoethane
作者:Xiaojing Yan、Chang Li、Xiaofei Xu、Xiaoyong Zhao、Yuanjiang Pan
DOI:10.1002/adsc.201901534
日期:2020.5.12
A dealkylative intercepted [2, 3]‐sigmatropic rearrangement reaction of allylic sulfides with 2, 2, 2‐trifluorodiazoethane (CF3CHN2) is reported, the commercially available and biocompatible catalyst hemin was found to efficiently catalyze this transformation across a diverse set of allylic sulfides with in situ generated CF3CHN2, providing excellent yields (up to 99%) under mild condition without
Difluoroacetaldehyde
<i>N</i>
‐Triftosylhydrazone (DFHZ‐Tfs) as a Bench‐Stable Crystalline Diazo Surrogate for Diazoacetaldehyde and Difluorodiazoethane
study, we developed a bench-stable difluoroacetaldehyde N-triftosylhydrazone (DFHZ-Tfs) as an operationally safe diazo surrogate that can release in situ two low-molecular-weight diazoalkanes, diazoacetaldehyde (CHOCHN2 ) or difluorodiazoethane (CF2 HCHN2 ), in a controlled fashion under specific conditions. DFHZ-Tfs has been successfully employed in the Fe-catalyzed cyclopropanation and Doyle-Kirmse
Rh(II)-Catalyzed [2,3]-Sigmatropic Rearrangement of Sulfur Ylides Derived from Cyclopropenes and Sulfides
作者:Hang Zhang、Bo Wang、Heng Yi、Yan Zhang、Jianbo Wang
DOI:10.1021/acs.orglett.5b01542
日期:2015.7.2
Rh2(OAc)4-catalyzed [2,3]-sigmatropicrearrangement of sulfurylides is reported. A series of cyclopropenes were successfully employed for [2,3]-sigmatropicrearrangement by a reaction with either allylic or propargylic sulfides. Under the optimized conditions, the reaction afforded the products in moderate to excellent yields. In these transformations, the vinyl metal carbenes generated in situ from the cyclopropenes
Catalytic Asymmetric [2,3]-Sigmatropic Rearrangement of Sulfur Ylides Generated from Copper(I) Carbenoids and Allyl Sulfides
作者:Xiaomei Zhang、Zhaohui Qu、Zhihua Ma、Weifeng Shi、Xianglin Jin、Jianbo Wang
DOI:10.1021/jo025687f
日期:2002.8.1
Catalytic asymmetric sulfur ylide [2,3]-sigmatropicrearrangement of carbenoids generated from aryldiazoacetates has been investigated with a number of chiral Rh(II) and Cu(I) catalysts, and moderately high enantioselectivity (52-78% ee) can be achieved with Cu(MeCN)(4)PF(6)/2,2'-isopropylidenebis[(4S)-4-tert-butyl-2-oxazoline].