The formation of oxygen-containing heterocycles via intramolecular cyclizations of halo-substituted acylsilanes and unsaturated acylsilanes
摘要:
Halo-substituted acylsilanes undergo cyclizations easily when heated in a polar solvent such as NMP to afford 2-silyldihydrofurans and 2-silyldihydropyrans. Unsaturated acylsilanes undergo cyclizations through reactions with iodine, phenylselenenyl bromide, or chloride. Further reactions of the cyclized products with pyridinium perbromide, phenylselenenyl bromide, or chloride give highly functionalized dihydrofurans and dihydropyrans. (C) 1999 Elsevier Science Ltd. All rights reserved.
We have developed the first general method for a stereoselective olefination of acylsilanes via ynolate anions to produce (Z)-beta-silyl-alpha,beta-unsaturated ester, which leads to tri- and tetrasubstitutedalkenes.
Radical Philicity Inversion in Co- and Fe-Catalyzed Hydrogen-Atom-Transfer-Initiated Cyclizations of Unsaturated Acylsilanes
作者:Bin Wu、Rong Zhu
DOI:10.1021/acscatal.9b04774
日期:2020.1.3
hydrogen-atom-transfer reactions involving unsaturated acylsilanes. Guided by the same concept, we have explored two transformations, namely, a Co-catalyzed cycloisomerization reaction and a Fe-catalyzed cyclization/Giese addition reaction. Both reactions involve the generation of a versatile α-siloxy radical intermediate via concomitant philicity inversion and radical translocation, which is mechanistically
Enantio- and Diastereoselective Tandem Zn-Promoted Brook Rearrangement/Ene−Allene Carbocyclization Reaction
作者:Rozalia Unger、Fritz Weisser、Nicka Chinkov、Amnon Stanger、Theodore Cohen、Ilan Marek
DOI:10.1021/ol9004036
日期:2009.4.16
The zinc-catalyzed addition of various alkynes to acylsilanes followed by a Zn−Brook rearrangement and either the Zn−ene−allene or Zn−yne−allene cyclization led to the enantio- and diastereoselective formation of carbocycles in a single-pot operation.
Diastero- and enantioselective intramolecular carbometalation reaction
作者:Rozalia Unger、Theodore Cohen、Ilan Marek
DOI:10.1016/j.tet.2010.04.038
日期:2010.6
The zinc-catalyzed addition of various alkynes to acylsilanes followed by a Zn-Brook rearrangement and either the Zn-ene-allene or Zn-yne-allene cyclization led to the enantio- and diastereoselective formation of carbocycles in a single-pot operation. (C) 2010 Elsevier Ltd. All rights reserved.
Cyclizations of functionalized acylsilanes to form 2-silyldihydropyrans and 2-silyldihydrofurans
作者:Yeun Min Tsai、Hong Chang Nieh、Chaur Donp Cherng
DOI:10.1021/jo00052a006
日期:1992.12
Cyclizations of (delta-haloacyl)- and (gamma-haloacyl)silanes in a polar aprotic solvent gave 2-silyldihydropyrans and 2-silyldihydrofurans in good yields. This new type of cyclization could also be initiated by a carbocation and an olefin.