In situ Generation and Utilization of CO: An Efficient Route
towards N-Substituted Saccharin via Carbonylative Cyclization of 2-Iodosulfonamides
作者:Bhalchandra Bhanage、Sujit Chavan、Adithyaraj K.
DOI:10.1055/s-0036-1588422
日期:2017.9
The present protocol demonstrates the synthesis of N-substituted saccharines via carbonylative cyclization of 2-iodosulfonamides using a Pd(OAc) 2 /Xantphos catalyst system and phenylformate as a CO source. A variety of saccharin derivatives is synthesized under milder reaction conditions.
本协议演示了使用 Pd(OAc) 2 /Xantphos 催化剂系统和苯甲酸作为 CO 源通过 2-碘磺酰胺的羰基化环化合成 N 取代的糖精。多种糖精衍生物是在较温和的反应条件下合成的。
Sulfonamide and Tertiary Amine as Nucleophiles in Pd(II)-Catalyzed Diamination of Alkynes: Synthesis of Tetracyclic Indolobenzothiazine <i>S</i>,<i>S</i>-Dioxides
作者:Tu M. Ha、Bo Yao、Qian Wang、Jieping Zhu
DOI:10.1021/acs.orglett.5b02621
日期:2015.11.6
Pd(II)-catalyzed oxidative double cyclization of the 1,2-diarylethynes bearing an N-methyl-N-(2-methoxycarbonyl)ethylamino and an aminosulfonyl group afforded indolobenzothiazine S,S-dioxides in good to excellent yields. The 2-(methoxycarbonyl)ethyl group attached to the indolyl nitrogen is readily removed under basic conditions (DBU, DMF, 120 °C) to provide the corresponding tetracycles with a free
Straightforward Synthesis of Bis[(trifluoromethyl)sulfonyl]ethylated Isocoumarins from 2-Ethynylbenzoates
作者:A. Sonia Petcu、Carlos Lázaro-Milla、F. Javier Rodríguez、Isabel Iriepa、Óscar M. Bautista-Aguilera、Cristina Aragoncillo、José M. Alonso、Pedro Almendros
DOI:10.1021/acs.joc.3c00611
日期:2023.6.2
facile isocoumarin and isoquinolone preparation by taking advantage of an initial bis(triflyl)ethylation [triflyl = (trifluoromethyl)sulfonyl] reaction, followed by heterocyclization, which contrasts with our previous results on cyclobutene formation. The efficiency of the catalyst- and irradiation-free heterocyclization/bis(triflyl)ethylation sequence showed exquisite dependence on the electronic nature
作者:Xiaolong Su、Honggui Huang、Wei Hong、Jianchao Cui、Menglin Yu、Yi Li
DOI:10.1039/c7cc08362a
日期:——
An unprecedented in situ SO2-capture cascade triggered by alkylradicals has been documented herein. Mechanistic investigations suggest that, triggered by alkylradicals, SO2 was released in situ and subsequently fixed into polycyclic small molecules. A wide range of alkylsulfonyl substituted polycyclic compounds were easily prepared with high yields and good functional group tolerability.
Indole Synthesis through Sequential Electrophilic N−H and C−H Bond Activation Using Iodine(III) Reactivity
作者:Laura Fra、Kilian Muñiz
DOI:10.1002/chem.201504974
日期:2016.3.18
3‐diarylated indoles is reported. The reaction follows an intramolecular electrophilic N−H and C−H bond functionalization between the aniline and acetylene. This methodology employs the concept of a traceless tether to provide access to the free 2,3‐diarylated indole products comprising a total of 18 examples. Hypervalent iodine reagents were identified as suitable promoters and four different protocols