New approaches toward the synthesis of (D-homo) steroid skeletons using Mukaiyama reactions
作者:Florence C.E. Sarabèr、Alexander Baranovsky、Ben J.M. Jansen、Maarten A. Posthumus、Aede de Groot
DOI:10.1016/j.tet.2005.11.056
日期:2006.2
Mukaiyama reaction between the silylenolether of 6-methoxytetralone and 2-methyl-2-cyclopentenone or carvone, with transfer of the silylgroup to the receiving enone, gave a second silylenolether. Addition of a carbocation, generated under Lewis acid conditions from 3-methoxy-2-butenol, 3-ethoxy-3-phenyl-2-propenol or 3-methoxy-2-propenol to this second silylenolether gave adducts, which could not
Direct access to functionalized benzotropones, azepanes, and piperidines by reductive cross-coupling of α-bromo enones with α-bromo enamides
作者:Timothy K. Beng、Kayla Sincavage、Ann Wens V. Silaire、Amir Alwali、Daniel P. Bassler、Laura E. Spence、Oliver Beale
DOI:10.1039/c5ob00517e
日期:——
The synthesis of functionalized azepenes and piperidines bearing an α-cycloheptenone or benzotropone derivative has been accomplished through direct reductive cross-coupling of α-bromo eneformamides or enecarbamates with highly versatile α-bromo benzotropone derivatives, under cobalt catalysis. The coupling products have been further elaborated to other synthetically useful aza-heterocyclic frameworks
A new approach toward the synthesis of C,D-cis coupled steroid and C,D-cis coupled d-homosteroid skeletons
作者:Svetlana Dratch、Tanya Charnikhova、Florence C.E Sarabèr、Ben J.M Jansen、Aede de Groot
DOI:10.1016/s0040-4020(03)00629-x
日期:2003.6
procedure has been developed for the synthesis of C,D-cis coupled steroid and d-homo steroid skeletons. A Mukaiyama reaction with transfer of the silyl group of the starting silylenolether to the enol of the adduct followed by addition of vinyl magnesium bromide to the unprotected carbonyl group leads to adducts which can be cyclized with ZnBr2. The synthesis of functionalized steroid skeletons in overall
The Palladium-Catalyzed Glycosylation of Halotropones
作者:Qi Chen、Ping Lan、Shen Tan、Martin G. Banwell
DOI:10.1021/acs.orglett.2c04099
日期:2023.1.20
A range of mono- and disaccharides, including glucose derivative 10, has been cleanly coupled, in the presence of a Pd catalyst, with various halogenated and structurally distinctive tropones, including “parent” compound 11, to afford the corresponding α- and β-anomeric forms of the tropolone glycosides, e.g., 12 and 13, respectively. Varying the ligand used influences the anomer distribution significantly