Alkene homologation <i>via</i> visible light promoted hydrophosphination using triphenylphosphonium triflate
作者:Vitalij V. Levin、Alexander D. Dilman
DOI:10.1039/d0cc07025d
日期:——
A hydrophosphination reaction of alkenes with triphenylphosphonium triflate under photocatalytic conditions is described. The reaction is promoted by naphthalene-fused N-acylbenzimidazole and is believed to proceed through intermediate formation of a phosphinyl radical cation. The resulting phosphonium salts are directly involved in the Wittig reactionleading to homologated alkenes.
Visible-light-promoted radical alkylation/cyclization of allylic amide with N-hydroxyphthalimide ester: Synthesis of oxazolines
作者:Zhiyang Yan、Bin Sun、Panyi Huang、Haiyun Zhao、Hao Ding、Weike Su、Can Jin
DOI:10.1016/j.cclet.2021.09.067
日期:2022.4
An efficient photocatalytic alkylation/cyclization of allylic amide with N-hydroxyphthalimide ester has been developed. The transformation is taken advantage of alkyl radicals to attack allylic amide with the assist of inexpensive rose bengal as photocatalyst to prepare a series of alkyl substituted oxazolines in moderate to excellent yields. High regioselectivity, operational safety, mild conditions
Visible-Light-Induced Regioselective Alkylation of Coumarins via Decarboxylative Coupling with <i>N</i>-Hydroxyphthalimide Esters
作者:Can Jin、Zhiyang Yan、Bin Sun、Jin Yang
DOI:10.1021/acs.orglett.9b00327
日期:2019.4.5
An efficient photocatalytic decarboxylative 3-position alkylation of coumarins by using alkyl N-hydroxyphthalimide esters as alkylationreagents has been developed. A variety of NHP esters derived from aliphatic carboxylicacids (primary, secondary, and tertiary) has been proved to be tolerated for this decarboxylation process, affording a broad scope of 3-alkylated coumarin derivatives in moderate
visible-light-promoted decarboxylativealkylation of vinylcyclopropanes with alkyl N-(acyloxy)phthalimide esters through the dual C–C bond and single N–O bond cleavage, employing triphenylphosphine and lithium iodide as the photoredox system to synthesize 2-alkylated 3,4-dihydronaphthalenes, has been established. This alkylation/cyclization involves a radical process and undergoes a sequence of N-(acyloxy)phthalimide
Highly
<i>E</i>
‐Selective Olefin Synthesis Catalysed by Novel Quinoxalinone Photocatalyst under Visible Light Conditions
作者:Xin Xu、Jie Huang、Dandan Gao、Jiahua Wang、Xiang‐Ying Tang、Long Wang
DOI:10.1002/chem.202300360
日期:——
An efficient method for the synthesis of highly E-selective olefins directly utilizing alkyl boronic acids as radical precursors was developed, catalysed by novel quinoxalinone-type catalyst.