Synthesis and Some Chemical Transformations of Unsaturated Ketones of the Dihydropyran Series
作者:M. I. Shatirova、N. Kh. Gusiyev、A. G. Aliyev、Sh. F. Nagiyeva
DOI:10.1134/s1070428019090069
日期:2019.9
Methods have been developed for the synthesis of unsaturated ketones of the dihydropyran series via aldolization-crotonization of 3,4-dihydro-2H-pyran-2-carbaldehyde with someunsaturated ketones. Among the proposed methods, the optimal were reactions carried out in 20% alcoholic sodium hydroxide at room temperature, which ensured higher selectivity, high yield (85-95%) of the target products, and
Acylation of Unsaturated Halides, Alcohols, Esters and Ketones
作者:Didier Barbry、Catherine Faven、Aziz Ajana
DOI:10.1080/00397919308013794
日期:1993.11
Abstract treatment of the title compounds with acyl halide and Lewis acid affords unsaturatedketones (mainly α-β with aluminium chloride, selectively β-γ with silver tetrafluoroborate). Reduction of the alkenyl group gives polyfunctional ketones.
Palladium-Catalyzed Enantioselective Decarboxylative Allylic Alkylation of Acyclic α-<i>N</i>-Pyrrolyl/Indolyl Ketones
作者:Remi Lavernhe、Eric J. Alexy、Haiming Zhang、Brian M. Stoltz
DOI:10.1021/acs.orglett.0c01303
日期:2020.6.5
The synthesis of fully substituted α-N-pyrrolyl and indolyl ketones via enantioselectivepalladium-catalyzedallylic alkylation is described. The acyclic ketones are alkylated in high yields with high enantioselectivities through the use of an electron-deficient phosphinooxazoline ligand, furnishing a highly congested and synthetically challenging stereocenter. The obtained alkylation products contain
Manipulation of Spiroindolenine Intermediates for Enantioselective Synthesis of 3‐(Indol‐3‐yl)‐Pyrrolidines
作者:Zi‐Lei Xia、Chao Zheng、Xiao‐Wei Liang、Yue Cai、Shu‐Li You
DOI:10.1002/anie.201812344
日期:2019.1.21
By manipulating the reactivity of spiroindolenine species, a sequential Michael/retro‐Mannich/Mannich reaction of ω‐indol‐3‐yl α,β‐unsaturated ketones was developed. In the presence of 10 mol % of a chiral phosphoric acid as the catalyst, a series of 3‐(indol‐3‐yl)‐pyrrolidines were synthesized in high yields (up to 91 %) with excellent stereoselectivities (up to 92 % ee, >19:1 d.r.). The products