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
Chiral synthesis via organoboranes. 24. B-allylbis(2-isocaranyl)borane as a superior reagent for the asymmetric allylboration of aldehydes
作者:Herbert C. Brown、Ramnarayan S. Randad、Krishna S. Bhat、Marek Zaidlewicz、Uday S. Racherla
DOI:10.1021/ja00162a047
日期:1990.3
Le reactif utilise : l'(allyl bis-isocaranyl) borane est prepare a partir du (+)-carene-2 obtenu par isomerisation du (+)-carene-3
Le reactif利用:l'(allyl bis-isocaranyl) borane est prepare a partir du (+)-carene-2 obtenu par isomerisation du (+)-carene-3
Allyl Alcohol as an Acrolein Equivalent in Enantioselective C–C Coupling: Total Synthesis of Amphidinolides R, J, and S
作者:Cole C. Meyer、Katherine L. Verboom、Madeline M. Evarts、Woo-Ok Jung、Michael J. Krische
DOI:10.1021/jacs.3c01809
日期:——
The first systematic study of catalytic enantioselective 1,2-additions to acrolein is described. Specifically, using allyl alcohol as a tractable, inexpensive acrolein proelectrophile, iridium-catalyzed acrolein allylation is achieved with high levels of regio-, anti-diastereo-, and enantioselectivity. This process delivers 3-hydroxy-1,5-hexadienes, a useful compound class that is otherwise challenging
描述了丙烯醛催化对映选择性 1,2-加成的首次系统研究。具体而言,使用烯丙醇作为易于处理的、廉价的丙烯醛亲电子试剂,实现了铱催化的丙烯醛烯丙基化,具有高水平的区域选择性、反非对映选择性和对映选择性。该过程产生 3-羟基-1,5-己二烯,这是一种有用的化合物类别,否则很难通过对映选择性催化获得。该方法的两次使用解锁了两栖内酯 R(9 vs 23 步骤,LLS)和两栖内酯 J(9 vs 23 或 26 步骤,LLS)的简明全合成,其制备步骤少于以前可能的一半,并且首次全合成 amphidinolide S(10 步,LLS)。
Hafner, Andreas; Duthaler, Rudolf O.; Marti, Roger, Journal of the American Chemical Society, 1992, vol. 114, # 7, p. 2321 - 2336
作者:Hafner, Andreas、Duthaler, Rudolf O.、Marti, Roger、Rihs, Grety、Rothe-Streit, Petra、Schwarzenbach, Franz