Generation of Indeno[1,2-c]pyrroles via a Pd-Catalyzed Reaction of 2-Alkynylbromobenzene with Propargylic Sulfonamide
摘要:
A novel route for the efficient assembly of indeno[1,2-c]pyrrole derivatives via a palladium-catalyzed tandem reaction of 2-alkynylbromobenzene with propargylic sulfonamide is reported. The starting materials are easily available, and the reaction proceeds smoothly with good functional group tolerance.
Synthesis of Halogenated Cyclic Enamines from Cyclic
<i>N‐</i>
2‐En‐4‐ynyl‐
<i>N</i>
‐1‐ynylamides and
<i>N</i>
‐Propargyl‐
<i>N</i>
‐1‐ynylamides via a Tandem Iron Halide Promoted N‐to‐C Shift‐Aza‐Prins Cyclization Sequence
作者:Hsin‐Hui Lin、Tai‐Ching Chiang、Rong‐Xuan Wu、Yi‐Mei Chang、Hao‐Wen Wang、Ssu‐Ting Liu、Ming‐Chang P. Yeh
DOI:10.1002/adsc.201801469
日期:2019.3.15
A facile and efficient N‐to‐C allyl shift‐aza‐Prins cyclization sequence of cyclicN‐2‐en‐4‐ynyl‐N‐1‐ynylamides is promoted by iron(III) chloride, generating chloro‐containing bridged bicyclic enamines in minutes and in high yields. This reaction involves an unprecedented formation of a ketenimine via Fe(III)‐mediated N‐to‐C allyl rearrangement, followed by aza‐Prins cyclization. This sequence can
Synthesis of Polysubstituted Furan Frameworks via [3 + 2] Annulation of <i>N</i>-Enoxyimides with Chelated Alkynes Initiated by Rh(III)-Catalyzed C–H Activation
作者:Min Wu、Yi Wang、Jing Zhou、Ting Wang、Hui Gao、Zhi Zhou、Wei Yi
DOI:10.1021/acs.orglett.3c00377
日期:2023.4.14
two-carbon synthon and the −OH/–NHR moiety in the alkynes was found to be crucial for realizing the desired chemo-/regioselectivity. Detailed experimental mechanistic studies together with DFT calculations clarified the sequential C–H activation/regioselective alkyne insertion/simultaneous O–N bond cleavage and hydrogen transfer/intramolecular nucleophilic addition/aromatization reaction path, which