Highly Stereoselective Synthesis of Tetrasubstituted Acyclic All-Carbon Olefins via Enol Tosylation and Suzuki–Miyaura Coupling
作者:Beryl X. Li、Diane N. Le、Kyle A. Mack、Andrew McClory、Ngiap-Kie Lim、Theresa Cravillion、Scott Savage、Chong Han、David B. Collum、Haiming Zhang、Francis Gosselin
DOI:10.1021/jacs.7b05071
日期:2017.8.9
A highly stereocontrolled synthesis of tetrasubstituted acyclic all-carbon olefins has been developed via a stereoselective enolization and tosylate formation, followed by a palladium-catalyzed Suzuki-Miyaura cross-coupling of the tosylates and pinacol boronic esters in the presence of a Pd(OAc)2/RuPhos catalytic system. Both the enol tosylation and Suzuki-Miyaura coupling reactions tolerate an array
1,2‐Aryl Migration Induced by Amide C−N Bond‐Formation: Reaction of Alkyl Aryl Ketones with Primary Amines Towards α,α‐Diaryl β,γ‐Unsaturated γ‐Lactams
作者:Rong Hu、Yigao Tao、Xiaofeng Zhang、Weiping Su
DOI:10.1002/anie.202014900
日期:2021.4.6
that incorporates an unusual 1,2‐aryl migration induced by amide C−N bond formation to produce a class of structurally novel α,α‐diaryl β,γ‐unsaturated γ‐lactams in generally good‐to‐excellent yields. This cascade reaction has a broad substrate scope with respect to primary amines, allows a wide spectrum of (hetero)aryl groups to smoothly undergo 1,2‐migration, and tolerates electronically diverse
Catalytic Enantioselective Synthesis of Acyclic Quaternary Centers: Palladium-Catalyzed Decarboxylative Allylic Alkylation of Fully Substituted Acyclic Enol Carbonates
作者:Eric J. Alexy、Haiming Zhang、Brian M. Stoltz
DOI:10.1021/jacs.8b05560
日期:2018.8.15
The firstenantioselective palladium-catalyzed decarboxylative allylic alkylation of fully substituted acyclic enol carbonates providing linear α-quaternary ketones is reported. Investigation into the reaction revealed that the use of an electron-deficient phosphinooxazoline ligand renders the enolate geometry of the starting material inconsequential, with the same enantiomer of product obtained in
Cis and trans isomers of 1,2-diphenyl-1,2,3,4-tetrahydronaphthalenes, novel processes for the preparation thereof, and novel intermediates are disclosed herein. The novel 1,2-diphenyl-1,2,3,4-tetrahydronaphthalenes have utility as antifertility estrogenic, anti-estrogenic, anti-spermatogenic, cholesterol lowering and lipid normalizing agents.
Estrogenic and antiestrogenic activity of monophenolic analogs of tamoxifen, [(Z)-2-[p-(1,2-diphenyl-1-butenyl)phenoxy]-N,N-dimethylethylamine]
作者:Peter C. Ruenitz、Jerome R. Bagley、Corwin M. Mokler
DOI:10.1021/jm00351a010
日期:1982.9
Five hydroxylated analogues of tamoxifen [1, (Z)-2-[p-(1,2-diphenyl-1-butenyl)phenoxy]-N,N-dimethylethylamine] and its geometric isomer were prepared by reaction of protected hydroxy-alpha-ethyldeoxybenzoins with 4-[2-dimethylamino) ethoxy]phenylmagnesium bromide, followed by acid-catalyzed dehydration-deprotection and chromatographic separation of isomer mixtures. Estrogen receptor binding affinity and estrogenic and antiestrogenic activity of each of the compounds were determined in the rat, in comparison with 4-hydroxytamoxifen (2). The new compounds had a wide range of receptor binding affinities, with that of 3-hydroxytamoxifen (6c), the most strongly bound, approaching that of estradiol. The trans isomers 6a,b were more strongly bound than were the cis isomers 7a,b. Antiestrogenic activity was seen in all compounds except 7b. This was also true for estrogenic activity, except that in 6c this activity was also substantially reduced. Maximal antiestrogenic effectiveness of 6c occurred at a 10-fold greater daily dose (50 micrograms/rat) than that required for maximal effect of 2.