Total Synthesis of Biselyngbyolide B and Its C21–C22 <i>Z</i>-Isomer
作者:Lena Kämmler、Martin E. Maier
DOI:10.1021/acs.joc.8b00298
日期:2018.4.20
implementing an intramolecular Stillecoupling for macrolactonization, the 21Z-isomer of biselyngbyolide B (47) was obtained. For preparation of a C14–C23 fragment with the 21E-configuration, a cross-coupling of vinylstannane 48 with 4-bromocrotonate (49) set the configuration of the two double bonds. Biselyngbyolide B (2) was then accessed by an intramolecular Heckcoupling. In preliminary biological
Reactivity Studies of 3,3-Bis(trimethylsilyl)-2-methyl-1-propene in Lewis Acid-Catalyzed Allylation Reactions
作者:David R. Williams、Ángel I. Morales-Ramos、Catherine M. Williams
DOI:10.1021/ol0613160
日期:2006.9.1
which possess geminal bis-trimethylsilyl substitution, are readilypreparedfrom E- or Z-alkenyl bromides. The reactivity of 3,3-bis(trimethylsilyl)-2-methyl-1-propene (1) is described and predominantly provides ene reactions with aldehydes to give alcohol 2 in the presence of BF3.OEt2. Alternatively, Sakurai allylation reactions of 1 are observed by using stronger Lewis acids in methylene chloride