A concise synthesis of 12(S),20-dihydroxyeicosa-5(Z),8(Z),10(E),14(Z)-tetraenoic acid, an endogenous vasoconstrictor
摘要:
12(S), 20-DiHETE, prepared by a combination of Evans-Crimmins asymmetric alkylation, Sonogashira alkynylation, and Suzuki-Miyaura cross-coupling, significantly sensitizes phenylephrine-induced vasoconstriction of rat renal interlobar arteries. (C) 2004 Elsevier Ltd. All rights reserved.
Development of a general copper-catalyzed vinylic Finkelstein reaction—application to the synthesis of the C1–C9 fragment of laingolide B
作者:Antoine Nitelet、Kévin Jouvin、Gwilherm Evano
DOI:10.1016/j.tet.2016.07.018
日期:2016.10
conditions compatible with a range of highly functionalized substrates. The potential of this vinylic halogen exchange reaction in total synthesis and medicinal chemistry was demonstrated by its successful use for the synthesis of the C1–C9 fragment of laingolide B and for the late-stage modification of drug-like molecules. The extension of this halogen exchange to the acetylenic and allenic Finkelstein
Engaging Alkenyl Halides with Alkylsilicates via Photoredox Dual Catalysis
作者:Niki R. Patel、Christopher B. Kelly、Matthieu Jouffroy、Gary A. Molander
DOI:10.1021/acs.orglett.6b00024
日期:2016.2.19
Single-electron transmetalation via photoredox/nickel dual catalysis provides the opportunity for the construction of Csp3–Csp2 bonds through the transfer of alkyl radicals under very mild reaction conditions. A general procedure for the cross-coupling of primary and secondary (bis-catecholato)alkylsilicates with alkenyl halides is presented. The developed method allows not only alkenyl bromides and
A 1,3-dipolar cycloaddition of alicyclic methylene iminium ylide to form pyrrolizidine nuclei and its application to synthesis of pyrrolizidine alkaloids.
Efficient synthesis of pyrrolizidines and indolizidines has been achieved by reacting tetracyclic hexahydro-1, 3, 5-triazines with olefinic and acetylenic compounds in the presence of trimethylsilylmethyl trifluoromethanesulfonate and cesium fluoride. This reaction was applied to the synthesis of several pyrrolizidine alkaloids, (±)-trachelanthamidine, (±)-supinidine, and (±)-isoretronecanol.
Allylation and Vinylation of Aryl Radicals Generated from Diazonium Salts
作者:Markus R. Heinrich、Olga Blank、Daniela Ullrich、Marcel Kirschstein
DOI:10.1021/jo701717k
日期:2007.12.1
Allylation and vinylation of arylradicals generated from aryl diazonium salts provides rapid and efficient access to chlorinated and brominated derivatives of styrene and allylbenzene. Allyl chlorides were found to be better substrates than bromides due to decreased halogen transfer. Donor- and acceptor-substituted diazonium salts are well tolerated. The products represent important precursors for
Stereoselective Hydrohalogenation of Alkynoic Acids and Their Esters in Ionic Liquids
作者:José Salazar、Francys Fernández、Jelem Restrepo、Simón E. López
DOI:10.3184/030823407x200038
日期:2007.3
A novel procedure is described for the hydrohalogenation of alkynoic acids and their esters using N-alkylpyridinium ionic liquids. Hydrohalogenating agents were prepared by mixing N-alkylpyridinium halides with an equimolar amount of trifluoroacetic acid. The corresponding halogenated alkenes were obtained in good yields with high diastereoselectivity.