3588-18-9Relevant academic research and scientific papers
Stereoselective Synthesis of (E)-Tagetone
Kunz, Joachim,Breitmaier, Eberhard
, p. 707 - 708 (2007/10/02)
(E)-Tagetone (8) was prepared in four steps by successive alkylation of 1,3-dithiane (1) by 1-iodo-2-methylpropane (2) and by 3-ethoxy-2-methylacrolein (3), followed by treatment of the intermediate 4 with sulfuric acid.Wittig alkylenation of the resulting aldehyde 5 and removal of the protecting group affords the title compound in good yield. - Key Words: Tagetes glandulifera / (E)-Tagetone / 1,3-Dithiane / Oxopropylenation / Wittig alkylenation
ACYLATION OF 1,3-ALKADIENES BY ACYL FLUOROSULFONATES. STEREOSPECIFIC SYNTHESIS OF E AND Z ISOMERS OF CONJUGATED DIENONES
Gavrishova, T.I.,Shastin, A.V.,Balenkova, E.S.
, p. 580 - 583 (2007/10/02)
Acyl fluorosulfonates generated from acyl fluorides and SO3 permits acylation of butadiene and isoprene to give triconjugated dienones.This reaction proceeds stereospecifically and leads to E isomers of the corresponding dienones in the case of butadiene and Z isomers in the case of isoprene.
Reactions with α,β-Unsaturated Nitrile Oxides. Synthetic Studies in the Terpene Field. Synthesis of Tagetones, Ocimenones, Deodarone and Atlantone
Isager, Per,Thomsen, Ib,Torssell, Kurt B. G.
, p. 806 - 813 (2007/10/02)
The generation and 1,3-dipolar cycloaddition of α,β-unsaturated nitrile oxides are described.Selective reductive cleavage of the isoxazoline ring was achived.Subsequent elimination of water leads to the 1,4-dien-3-one system.The formation of tetrahydro-γ-pyrones is observed.The reactions were applied to the synthesis of tagetones, ocimenones, deodarone and atlantone.
Trityl Salt Catalyzed Aldol Reaction between α,β-Acetylenic Ketones and Silyl Enol Ethers
Kobayashi, Shu,Matsui, Shigekazu,Mukaiyama, Teruaki
, p. 1491 - 1494 (2007/10/02)
In the presence of a catalytic amount of trityl salt, α,β-acetylenic ketones react with silyl enol ethers to afford the corresponding aldol adducts (1,2-addition products) stereoselectively in high yields.Naturally occurring monoterpenes, trans- and cis-tagetones, are synthesized by the use of this reaction.
Stereoselective Synthesis of (E)-α-Hydroxy-1,3-dienes via the Reaction of 2,5-Dihydrothiophene S,S-Dioxides with Carbonyl Compounds
Yamada, Sachiko,Suzuki, Hiromasa,Naito, Hiroyuki,Nomoto, Takashi,Takayama, Hiroaki
, p. 332 - 333 (2007/10/02)
A stereoselective synthesis of (E)-α0hydroxy -1,3-dienes, by thermal extrusion from adducts of 2,5-dihydrothiophene S,S-dioxide(1) with aldehydes and ketones, is presented and its extension to the synthesis of the dienone, (E)-tagetone, and of a 1,3,5-triene system, is illustrated.
REACTIONS OF UNSATURATED COMPOUNDS. CXIII. THE STEREOCHEMISTRY AND REGIOCHEMISTRY OF THE ACYLATION OF CONJUGATED SYSTEMS
Melikyan, G. G.,Babayan, E. V.,Atanesyan, K. A.,Badanyan, Sh. O.
, p. 1884 - 1889 (2007/10/02)
The stereochemistry and regiochemistry of the low-temperature acylation of vinylacetylene, chloroprene, bromoprene, and isoprene with carboxylic acid chlorides in the presence of aluminum chloride were studied.It was shown that mixtures of the geometric isomers of 3-chloro-1,3-alkadien-5-ones are formed in the case of vinylacetylene, and 1,4-adducts (which undergo stereoselective 1,4-dihydrochlorination with the preferential formation of cis-3-X-1,3-alkadien-5-ones) are formed in the other cases. cis-Tagetone was synthesized with a stereoisomeric purity of 83percent.
