Reaction of Indole Carboxylic Acid/Amide with Propargyl Alcohols: [4 + 3]-Annulation, Unexpected 3- to 2- Carboxylate/Amide Migration, and Decarboxylative Cyclization
作者:Karuppu Selvaraj、Shubham Debnath、K. C. Kumara Swamy
DOI:10.1021/acs.orglett.9b01686
日期:2019.7.19
indole-2-carboxylic acids/amides form fused seven-membered lactones/lactams (oxepinoindolones/azepinoindolones) upon treatment with substituted propargyl alcohols using catalytic Cu(OTf)2. Decarboxylative cyclization of 1-methylindole-2- or indole-3-carboxylic acids with substituted propargyl alcohols under Lewis (for 1-methylindole-2-carboxylic acid) or Brønsted (for 1-methylindole-3-carboxylic acid) acid catalysis
An unprecedented Lewisacidcatalyzed [4 + 3] cycloaddition reaction is described that provides a straightforward route to polycyclic products containing an imine-based indole azepine scaffold, starting from readily available internal tertiary alkynols and azides. This cycloaddition protocol provides efficient and atom-economical access to a new class of fascinating imine-containing products in satisfactory
HFIP-Catalyzed Difluoroalkylation of Propargylic Alcohols to Access Tetrasubstituted Difluoroalkyl Allenes
作者:Jinshan Li、Wenxue Xi、Saimei Liu、Chenxi Ruan、Xiaochun Zheng、Jianguo Yang、Lei Wang、Zhiming Wang
DOI:10.1021/acs.orglett.1c02659
日期:2021.9.17
access structurally diverse tetrasubstituted difluoroalkyl allenes has been developed. This convenient procedure enables the rapid construction of highly functionalized multisubstituted fluorinated allenes in a mild and straightforward way. Furthermore, the synthetic potential of this methodology has been demonstrated by the facile synthesis of various structurally interesting fluorine-containing molecules
Iodo(III)-Meyer–Schuster Rearrangement of Propargylic Alcohols Promoted by Benziodoxole Triflate
作者:Roshayed Ali Laskar、Wei Ding、Naohiko Yoshikai
DOI:10.1021/acs.orglett.1c00039
日期:2021.2.5
rearrangement of propargylicalcohols into α,β-unsaturated ketones bearing an α-λ3-iodanyl group. This iodo(III)-Meyer–Schuster rearrangement proceeds under mild conditions and tolerates a variety of functionalized propargylicalcohols, thus complementing previously reported halogen-intercepted Meyer–Schuster rearrangement. The α-λ3-iodanylenones can be utilized for facile Pd-catalyzed cross-coupling for the
A novel and direct synthesis of 1‐aryl‐5‐arylvinyl‐tetrazoles from easily prepared propargylic alcohols and TMSN3 is developed in the presence of TMSCl under mild conditions (TMS=trimethylsilyl). The process involves an allenylazide intermediate, followed by a CC‐bond cleavage and CN‐bond formation to afford the desired products. Moreover, this method offers a good functional‐group applicability