Iron-Catalyzed Prins–Peterson Reaction for the Direct Synthesis of Δ<sup>4</sup>-2,7-Disubstituted Oxepenes
作者:Daniel A. Cruz、Victoria Sinka、Víctor S. Martín、Juan I. Padrón
DOI:10.1021/acs.joc.8b01978
日期:2018.10.19
A direct iron(III)-catalyzed Prins–Peterson reaction involving α-substituted γ-triphenylsilyl bis-homoallylic alcohols and aldehydes is described. Thus, cis-Δ4-2,7-disubstituted oxepenes were synthesized in a diastereoselective reaction using sustainable catalytic conditions (3–5 mol %). This highly productive process is the result of a cascade of three chemical events with the concomitant formation
Intramolecular Cyclopropanation of Unsaturated Terminal Epoxides and Chlorohydrins
作者:David M. Hodgson、Ying Kit Chung、Irene Nuzzo、Glòria Freixas、Krystyna K. Kulikiewicz、Ed Cleator、Jean-Marc Paris
DOI:10.1021/ja0672932
日期:2007.4.1
Lithium 2,2,6,6-tetramethylpiperidide (LTMP)-induced intramolecular cyclopropanation of unsaturated terminal epoxides provides an efficient and completely stereoselective entry to bicyclo[3.1.0]hexan-2-ols and bicyclo[4.1.0]heptan-2-ols. Further elaboration of C-5 and C-6 stannyl-substituted bicyclo[3.1.0]hexan-2-ols via Sn-Li exchange/electrophile trapping or Stille coupling generates a range of substituted
Substrate-Controlled Formal Synthesis of (+)-Laurenyne by a Chemoselective Chelation-Controlled Alkylation Strategy
作者:Deukjoon Kim、Byungsook Kim、Gukwha Cheon、Janghyun Park、Hyunjoo Lee、Hyoungsu Kim、Sanghee Kim
DOI:10.3987/com-07-s(w)41
日期:——
A substrate-controlled formalsynthesis of (+)-laurenyne has been accomplished featuring a highly stereoselective chemoselective chelation-controlled amide enolate alkylation for synthesis of the α,α'-syn-bis-alkene without resorting to use of a chiral auxiliary.
Shortest Enantioselective Total Syntheses of (+)-Isolaurepinnacin and (+)-Neoisoprelaurefucin
作者:Victoria Sinka、Daniel A. Cruz、Víctor S. Martín、Juan I. Padrón
DOI:10.1021/acs.orglett.2c01769
日期:2022.7.29
The shortest enantioselectivetotalsyntheses of (+)-isolaurepinnacin and (+)-neoisoprelaurefucin have been accomplished. These syntheses were based on a common parallel synthetic strategy using Prins–Peterson cyclization in their core construction. In only one step, a seven-membered ring oxacycle with the correct cis-stereochemistry ring closure and the Δ4 position of the endocyclic double bond in