Hydration and Intramolecular Cyclization of Homopropargyl Sulfonamide Derivatives Catalyzed by Silver Hexafluoroantimonate(V): Synthesis of Structurally Diverse 2,3-Dihydro-1<i>H</i>
-Pyrroles
作者:Xiuling Yu、Zhonglin Guo、Hongjian Song、Yuxiu Liu、Qingmin Wang
DOI:10.1002/adsc.201701121
日期:2018.3.20
simple protocol for synthesis of structurally diverse functionalized 2,3‐dihydro‐1H‐pyrroles by hydration and intramolecular cyclization of homopropargyl sulfonamide derivatives. Mechanistic experiments revealed that the sulfonamide nitrogen participated in the hydration reaction by chelating the Ag atom of the catalyst to assist in the formation of the hydration intermediate. The protocol accommodated
Asymmetric Synthesis of Fused Bicyclic<i>N,O</i>- and<i>O,O</i>-Acetals via Cascade Reaction by Gold(I)/<i>N,N</i>′-Dioxide-Nickel(II) Bimetallic Relay Catalysis
hetero‐Diels‐Alder cascadereaction of β,γ‐unsaturated α‐ketoesters with alkyl amides or alcohols were accomplished. The process was based on the utilization bimetallic catalyst system with achiral gold(I) catalyst and chiral N,N′‐dioxide/Ni(II) catalyst, delivering a variety of fused bicyclic N,O‐acetals or O,O‐acetals in up to 99% yield and 99% ee with >19:1 dr under mild reaction conditions. Based
Silver-Catalyzed Cascade Cyclization/1,6-Conjugate Addition of Homopropargyl Sulfonamides to <i>p</i>-Quinone Methides: An Approach to Diverse 3-Diarylmethine Substituted Dihydropyrroles
作者:Sachin R. Shirsath、Ganesh S. Ghotekar、Vir Bahadur、Rajesh G. Gonnade、M. Muthukrishnan
DOI:10.1021/acs.joc.0c01922
日期:2020.12.4
disclosed. The reaction pathway involves an intramolecular cascade cyclization of homopropargyl sulfonamides to generate a highly reactive dihydropyrrole intermediate in situ followed by conjugate addition with p-quinone methides. This method provides an efficient and scalable route for the synthesis of 3-diarylmethine substituted dihydropyrroles, in onepot.
Rhodium(III)-Catalyzed [3+2] Annulation of 5-Aryl-2,3-dihydro-1<i>H</i>-pyrroles with Internal Alkynes through C(sp<sup>2</sup>)H/Alkene Functionalization
作者:Ming-Bo Zhou、Rui Pi、Ming Hu、Yuan Yang、Ren-Jie Song、Yuanzhi Xia、Jin-Heng Li
DOI:10.1002/anie.201407175
日期:2014.10.13
This study describes a new rhodium(III)‐catalyzed [3+2] annulation of 5‐aryl‐2,3‐dihydro‐1H‐pyrroles with internal alkynes using a Cu(OAc)2 oxidant for building a spirocyclic ring system, which includes the functionalization of an aryl C(sp2)H bond and addition/protonolysis of an alkene CC bond. This method is applicable to a wide range of 5‐aryl‐2,3‐dihydro‐1H‐pyrroles and internal alkynes, and
Rhodium-Catalyzed Annulation of 4-Arylbut-3-yn-1-amines with Internal Alkynes through C–H Functionalization
作者:Yang Li、Rui Pi、Xuan-Hui Ouyang、Ren-Jie Song、Jin-Heng Li
DOI:10.1021/acs.orglett.8b03561
日期:2019.1.18
A new, one-step rhodium(III)-catalyzed annulation of 4-arylbut-3-yn-1-amines with internal alkynes through C-H functionalization is reported. This reaction allows the formation of three new chemical bonds, including two C-C bonds and one C-N band, thus selectively assembling various spiro[indene-1,2'-pyrrolidine]s with excellent functional group compatibility, high atom-economy, and step-efficiency.