Sigmatropic Rearrangement-Based Synthesis of 4-Alkenyl-1,3-dithiol-2-ones
作者:Pavels Ostrovskis、Andrey A. Mikhaylov、Samir Z. Zard
DOI:10.1021/acs.orglett.9b01157
日期:2019.5.17
have been prepared by microwave-assisted rearrangement of S-(4-acyloxy-2-alkynyl)-O-ethyl xanthates in moderate to good yields. The synthetic approach is based on a combination of [3,3] and [1,5] sigmatropicrearrangements as well as the intermediacy of a reactive betaine that induces the ionic elimination of the acyloxy group. The [1,5] sigmatropicrearrangement was confirmed by a deuterium-labeling
Synthesis of exo enol ether-cyclic ketal isomers of substituted furanmethanol structures related to marine furanocembranoids
作者:Yi Li、Gerald Pattenden、Joseph Rogers
DOI:10.1016/j.tetlet.2009.12.131
日期:2010.3
of the epoxide 10 with p-TSA in MeOH produces the enol ether cyclic ketal 12, which is rapidly isomerised to the furanmethanol ether 15, isolated in 80% yield. By contrast, when the propanol-substituted furan epoxide 23 was kept in CDCl3 containing traces of HCl for 2 h, a 3:2 mixture of Z- and E-isomers of the enol ether spiro ketals 25a and 25b was produced in >92% yield; after 24 h this mixture of
Total Synthesis of Shearinines D and G: A Convergent Approach to Indole Diterpenoids
作者:Nicole Hauser、Michael A. Imhof、Sarah S. Eichenberger、Tomas Kündig、Erick M. Carreira
DOI:10.1002/anie.202112838
日期:2022.1.17
convergent total syntheses of (+)-shearinines G and D, fungal metabolites with interesting bioactivities, were accomplished through late-stage coupling of two complex fragments. Intramolecular rhodium-catalyzed cyclopropanation of a diazo ketone established the central trans-hydrindane motif bearing two vicinal quaternary stereocenters, thus providing a new approach to alkaloids of this type.
(+)-shearinines G 和 D(具有有趣生物活性的真菌代谢物)的高度收敛全合成是通过两个复杂片段的后期偶联完成的。重氮酮的分子内铑催化环丙烷化建立了带有两个邻位四元立体中心的中心反式-氢化茚基基序,从而为这种类型的生物碱提供了新的途径。
Allenic boranes. Their preparation and conversion into alkylallenes
作者:Teresa Leung、George Zweifel
DOI:10.1021/ja00824a077
日期:1974.8
Brel', V. K.; Dogadina, A. V.; Ionin, B. I., Journal of general chemistry of the USSR, 1980, vol. 50, # 6, p. 1008 - 1015
作者:Brel', V. K.、Dogadina, A. V.、Ionin, B. I.、Petrov, A. A.