Synthesis of 2- and 3-Indolylpyrroles via 1,3-Dipolar Cycloadditions of Münchnones and Nitroalkenes
摘要:
A series of 2- and 3-indolylpyrroles were generated via 1,3-dipolar cycloadditions between (2-nitrovinyl)indoles and symmetrical and unsymmetrical 1,3-oxazolium-5-olates (munchnones).
A straightforwardsynthesis of 1,2‐dicyanoalkanes by reacting nitroalkenes with trimethylsilyl cyanide in the presence of tetrabutylammoniumfluoride is described. The reaction proceeds through a tandem double Michael addition under mild conditions. Employing the hypervalent silicate generated from trimethylsilyl cyanide and tetrabutylammoniumfluoride is essential for achieving this transformation
A series of chiral polysulfonate cyclohexyldiamine-Ni(II) catalysts were prepared via sulfur (VI) fluoride exchange click-reactions. The catalysts exhibited good catalytic activity and enantioselectivity in the Michaeladdition of malonates to nitroalkenes. The excellent recyclability of the catalysts was demonstrated via the reuse of the privileged catalyst 7a for ten times. The results provide a
The stereochemical divergent synthesis of indolyl-pyrrolidines was accomplished using an imidazoline-aminophenol (IAP)–Ni(OAc)2 complex and a bis(imidazolidine)pyridine (PyBidine)–Cu(OTf)2 complex. The former catalyzed exo′-selective asymmetric [3 + 2] cyclization of iminoesters with indolyl nitroalkenes, and the latter catalyzed the reaction in an endo-selective manner. These catalysts are tolerant
An Enantio- and Diastereoselective Mannich/Pictet-Spengler Sequence To Form Spiro[piperidine-pyridoindoles] and Application to Library Synthesis
作者:Alejandra Riesco-Domínguez、Nick van der Zwaluw、Daniel Blanco-Ania、Floris P. J. T. Rutjes
DOI:10.1002/ejoc.201601508
日期:2017.1.18
tandem strategy based on a Mannich/Pictet−Spengler sequence has been developed and additionally applied to the synthesis of a new small library (fourteen examples) of privileged compounds based on the spiro[piperidine-pyridoindole] core. The sequence proceeds via a diastereoselective Pictet−Spengler cyclization, after condensation of several tryptamine derivatives with three novel piperidin-4-ones containing
Organocatalytic Regiodivergent Ring Expansion of Cyclobutanones for the Enantioselective Synthesis of Azepino[1,2-<i>a</i>]indoles and Cyclohepta[<i>b</i>]indoles
作者:Wu-Lin Yang、Wen Li、Zhong-Tao Yang、Wei-Ping Deng
DOI:10.1021/acs.orglett.0c01406
日期:2020.5.15
series of azepino[1,2-a]indoles were obtained with exclusive regioselectivities and high diastereo- and enantioselectivities (up to >20:1 dr, 96% ee) with the application of the N1 nucleophilic site of the indole nucleus. Meanwhile, various cyclohepta[b]indoles could be accessed with high enantiopurity (up to 96% ee) through the Michael addition/boron-trifluoride-etherate-promoted indole C3-attack