Sulfur Incorporation: Copper-Catalyzed Cascade Cyclization of 1,7-Enynes with Metal Sulfides toward Thieno[3,4-c]quinolin-4(5H)-ones
摘要:
A novel copper-catalyzed cascade cyclization of 1,7-enynes with metal sulfides is described. This sulfur-incorporation method provides straightforward access toward the important thiophene-fused quinolin-4(5H)-one scaffold through cyclization and double CS bond formation cascade, and the chemoselectivity of this 1,7-enyne cyclization toward 1,3,3a,9b-tetrahydrothieno[3,4-c]quinolin-4(5H)-ones and 3,3a-dihydrothieno[3,4-c]quinolin-4(5H)-ones can be controlled by varying the sulfur resources.
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。
Cascade Nitration/Cyclization of 1,7-Enynes with<i>t</i>BuONO and H<sub>2</sub>O: One-Pot Self-Assembly of Pyrrolo[4,3,2-<i>de</i>]quinolinones
作者:Yu Liu、Jia-Ling Zhang、Ren-Jie Song、Peng-Cheng Qian、Jin-Heng Li
DOI:10.1002/anie.201404192
日期:2014.8.18
Here we describe the one‐pot construction of the pyrrolo[4,3,2‐de]quinolinone scaffold by a cascadenitration/cyclization sequence of 1,7‐enynes with tBuONO and H2O. The cascade proceeds through alkene nitration, 1,7‐enyne 6‐exo‐trig cyclization, CH nitrations, and redox cyclization, and exhibits excellent functional group tolerance. The mechanism was investigated using in situ high‐resolution mass
One-Carbon Incorporation Using Cyclobutanone Oxime Ester Enabled [2 + 2 + 1] Carboannulation of 1,7-Enynes by C–C/N–O Bond Cleavage and C–H Functionalization
作者:Jiang-Xi Yu、Fan Teng、Jian-Nan Xiang、Wei Deng、Jin-Heng Li
DOI:10.1021/acs.orglett.9b03643
日期:2019.12.6
to produce canyo-functionalized 4H-cyclopenta[c]quinolin-4-ones is disclosed. ThroughC–C/N–O bond cleavage and C–H functionalization, the process enables one-carbon incorporation using cyclobutanone oximes to achieve [2 + 2 + 1] carboannulation of 1,7-enynes, which is highlighted by allowing the formation of four new bonds with high selectivity and broad substrate scope.
Oxidative radical divergent Si-incorporation: facile access to Si-containing heterocycles
作者:Yuan Yang、Ren-Jie Song、Yang Li、Xuan-Hui Ouyang、Jin-Heng Li、De-Liang He
DOI:10.1039/c7cc08964c
日期:——
which allows selective activation of dual chemical bonds around the Si-atom center relying on the nature of alkylsilanes. While for tertiary silanes selective functionalization of Si–H/silyl C(sp3)–H bonds in intermolecular oxidative annulation cascades with N-(2-(ethynyl)aryl)acrylamides toward silino[3,4-c]quinolin-5(3H)-ones, when using secondary silanes and HSi(TMS)3, dual Si–H bonds or Si–H/Si–Si
描述了避免使用昂贵的贵金属/配体催化体系的铜催化的氧化自由基策略,其允许依赖于烷基硅烷的性质选择性活化围绕硅原子中心的双化学键。而对于叔硅烷而言,在分子间氧化环氧化级联反应中,Si-H /甲硅烷基C(sp 3)-H键与N-(2-(乙炔基)芳基)丙烯酰胺对硅烷[3,4- c ] quinolin-5( 3 H)-ones,当使用仲硅烷和HSi(TMS)3时,双Si–H键或Si–H / Si–Si键被选择性裂解,形成4 H -silolo [3,4- c ] quinolin-4 -那些。