69967-78-8Relevant articles and documents
Synthesis of Highly Stereodefined Tetrasubstituted Acyclic All-Carbon Olefins via a Syn-Elimination Approach
Lim, Ngiap-Kie,Weiss, Patrick,Li, Beryl X.,McCulley, Christina H.,Hare, Stephanie R.,Bensema, Bronwyn L.,Palazzo, Teresa A.,Tantillo, Dean J.,Zhang, Haiming,Gosselin, Francis
supporting information, p. 6212 - 6215 (2017/11/24)
An efficient synthesis of stereodefined tetrasubstituted acyclic all-carbon olefins has been developed via a bis(2,6-xylyl)phosphate formation of stereoenriched tertiary alcohols, followed by in situ syn-elimination of the corresponding phosphates under mild conditions. This chemistry tolerates a wide variety of electronically and sterically diverse substrates and generates the desired tetrasubstituted olefins in high yields and stereoselectivities (>95:5) in most cases. This stereocontrolled olefin synthesis has been applied to the synthesis of anticancer drug tamoxifen in three steps from commercially available 1,2-diphenylbutan-1-one in 97:3 stereoselectivity and 78% overall yield.
Intramolecularly activated vinylsilanes: Fluoride-free cross-coupling of (Z)-β-(trialkylsilyl)acrylic acids
Shindo, Mitsuru,Matsumoto, Kenji,Shishido, Kozo
, p. 176 - 178 (2007/10/03)
The fluoride-free palladium-catalyzed cross-coupling reaction of trialkyl(vinyl)silanes activated by the intramolecular pentacoordination of carboxylic acid at the Z-β-position is described.
Short-step synthesis of tamoxifen and its derivatives via the three-component coupling reaction and migration of the double bond
Shiina, Isamu,Suzuki, Masahiko,Yokoyama, Kazutoshi
, p. 965 - 967 (2007/10/03)
The anti-tumor agent, tamoxifen, is easily synthesized by the successive allylation of benzaldehyde and the Friedel-Crafts alkylation reaction of anisole with the intermediary homoallyl silyl ethers, followed by the migration of the double bond to form the desired tetra-substituted ethylenes. Several derivatives of tamoxifen are also produced according to a similar synthetic strategy.