Demethylenative cyclization of 1,7-enynes using α-amino radicals as a traceless initiator enabled by Cu(i)-photosensitizers
摘要:
A Cu(i)-photosensitizer-enabled demethylenative radical cyclization of 1,7-enynes to access quinoline-2-(1H)-ones was successfully achieved using α-amino radicals as a traceless radical initiator.
Photocatalytic Decarboxylative [2 + 2 + <i>m</i>] Cyclization of 1,7-Enynes Mediated by Tricyclohexylphosphine and Potassium Iodide
作者:Hui-Yuan Liu、Yuan Lu、Yang Li、Jin-Heng Li
DOI:10.1021/acs.orglett.0c03182
日期:2020.11.20
photocatalytic decarboxylative [2 + 2 + m] cyclization of 1,7-enynes with alkyl N-hydroxyphthalimide (NHP) esters, using tricyclohexylphosphine and potassium iodide as redox catalysts, is reported for the construction of functional polycyclic compounds. This protocol tolerates primary, secondary, and tertiary alkyl NHP esters through a single reaction via decarbonylation, radical addition, C–H functionalization
据报道,使用三环己基膦和碘化钾作为氧化还原催化剂,用烷基N-羟基邻苯二甲酰亚胺(NHP)酯进行的1,7-烯炔的新型光催化脱羧[2 + 2 + m ]环化反应。该方案通过脱羰,自由基加成,CH-H官能化和在温和条件下环化的单一反应,可以耐受伯,仲和叔烷基NHP酯。
Metal-Free Radical [2+2+1] Carbocyclization of Benzene-Linked 1,<i>n</i>-Enynes: Dual C(sp<sup>3</sup>)H Functionalization Adjacent to a Heteroatom
作者:Ming Hu、Jian-Hong Fan、Yu Liu、Xuan-Hui Ouyang、Ren-Jie Song、Jin-Heng Li
DOI:10.1002/anie.201504603
日期:2015.8.10
A new metal‐free oxidative radical [2+2+1] carbocyclization of benzene‐linked 1,n‐enynes with two C(sp3)H bonds adjacent to the same heteroatom is described. This method achieves two C(sp3)H oxidative functionalizations and an annulation, thus providing efficient and general access to a variety of fused five‐membered carbocyclic hydrocarbons.
Cobalt‐Catalyzed Enantioselective Hydroboration/Cyclization of 1,7‐Enynes: Asymmetric Synthesis of Chiral Quinolinones Containing Quaternary Stereogenic Centers
作者:Caizhi Wu、Jiayu Liao、Shaozhong Ge
DOI:10.1002/anie.201903377
日期:2019.6.24
An asymmetric cobalt‐catalyzed hydroboration/cyclization of 1,7‐enynes to synthesize chiral six‐membered N‐heterocyclic compounds was developed. A variety of aniline‐tethered 1,7‐enynes react with pinacolborane to afford the corresponding chiral boryl‐functionalized quinoline derivatives in high yields with high enantioselectivity. This cobalt‐catalyzed asymmetric cyclization of 1,7‐enyens provides
Sulfur Incorporation Using Disulfanes as the Sulfur Atom Source Enabled Metal‐Free Heteroannulation of 1,7‐Enynes
作者:Jing‐Hao Qin、Jiang‐Xi Yu、Jin‐Heng Li、De‐Lie An
DOI:10.1002/adsc.201900621
日期:2019.9.3
A new oxidative [2+2+1] heteroannulation of 1,7‐enynes with disulfanes promoted by Et3N, producing 3,3a‐dihydro‐thieno[3,4‐c]quinolin‐4(5H)‐ones, is described. This reaction is achieved by using equivalent amounts of 1,7‐enynes, sulfur atoms (disulfanes), tert‐butyl peroxybenzoate (TBPB) as an oxidant and Et3N as the base, and represents an unprecedented strategy to applications of disulfanes as sulfur
Metal-free oxidative [2+2+1] heteroannulation of 1,7-enynes with thiocyanates toward thieno[3,4-<i>c</i>]quinolin-4(5<i>H</i>)-ones
作者:Jiang-Xi Yu、Shijie Niu、Ming Hu、Jian-Nan Xiang、Jin-Heng Li
DOI:10.1039/c9cc02242b
日期:——
metal-free oxidative [2+2+1] heteroannulation of 1,7-enynes with thiocyanates for producing thieno[3,4-c]quinolin-4(5H)-ones is presented. This reaction employs benzoylperoxide (BPO) as the oxidant and sodium thiocyanate as the sulfur source to enable the formation of three chemical bonds, two C–S bonds and one C–C bond, in a single reaction, and represents a new, practical access to S-heterocycles with
提出了一种新的无金属的1,7-烯炔与硫氰酸盐的氧化性[2 + 2 + 1]杂环化反应,用于生产噻吩并[3,4- c ]喹啉-4(5 H)-酮。该反应采用过氧化苯甲酰(BPO)作为氧化剂,硫氰酸钠作为硫源,可在一次反应中形成三个化学键,两个CS键和一个CC键,代表了一种新的实用途径避免使用金属催化剂和过量的碱。