7328-33-8Relevant academic research and scientific papers
Enantioselective and Diastereodivergent Synthesis of Spiroindolenines via Chiral Phosphoric Acid-Catalyzed Cycloaddition
Gandon, Vincent,Masson, Géraldine,Mati?i?, Mateja,Neuville, Luc,Van Elslande, Elsa,Varlet, Thomas
supporting information, p. 11611 - 11619 (2021/08/16)
A diastereodivergent and enantioselective synthesis of chiral spirocyclohexyl-indolenines with four contiguous stereogenic centers is achieved by a chiral phosphoric acid-catalyzed cycloaddition of 2-susbtituted 3-indolylmethanols with 1,3-dienecarbamates. Modular access to two different diastereoisomers with high enantioselectivities was obtained by careful choice of reaction conditions. Their functional group manipulation provides an efficient access to enantioenriched spirocyclohexyl-indolines and -oxindoles. The origins of this stereocontrol have been identified using DFT calculations, which reveal an unexpected mechanism compared to our previous work dealing with enecarbamates.
Palladium(ii)-catalyzed cross-coupling of simple alkenes with acrylates: A direct approach to 1,3-dienes through C-H activation
Wen, Zhen-Kang,Xu, Yun-He,Loh, Teck-Peng
, p. 4520 - 4524 (2013/11/19)
The results from a direct palladium-catalyzed cross-coupling reaction between a variety of olefins with acrylate through vinylic C-H activation that give the corresponding butadienes in moderate to good yields and stereoselectivities are reported. Given the reaction's ability to tolerate a wide range of styrenes, aliphatic alkenes and acrylates, this atom- and step-economical methodology offers a straightforward method to forge new C-C bonds of the valuable diene products from readily available starting materials under very mild reaction conditions.
Microwave-accelerated Ru-catalyzed hydrovinylation of alkynes and enynes: A straightforward approach toward 1,3-dienes and 1,3,5-trienes
Schabel, Tobias,Plietker, Bernd
, p. 6938 - 6941 (2013/06/27)
Quick, but not dirty! Microwave heating was found to have a significant effect on the Ru-catalyzed hydrovinylations of alkynes. A broad range of different terminal alkynes were coupled to methyl acrylate within just 30min in good to excellent yields (see scheme). This new protocol was transferred to the hydrovinylation of enynes as novel coupling partners in C-H-activation chemistry giving different 1,3,5-trienes as the sole products. Copyright
Pheromone synthesis. Part 249: Syntheses of methyl (R,E)-2,4,5- tetradecatrienoate and methyl (2E,4Z)-2,4-decadienoate, the pheromone components of the male dried bean beetle, Acanthoscelides obtectus (Say)
Mori, Kenji
experimental part, p. 1936 - 1946 (2012/04/10)
The enantiomers of methyl (E)-2,4,5-tetradecatrienoate (1), a component of the male pheromone of Acanthoscelides obtectus, were synthesized from the enantiomers of 1-undecyn-3-ol (6), which were obtained via asymmetric acetylation of (±)-1-trimethylsilyl-1-undecyn-3-ol (4) with vinyl acetate as catalyzed by lipase PS (Amano). The ortho ester Claisen rearrangement of 6 with triethyl orthoacetate was the key-step to generate the chiral allenic system. A new synthesis of (±)-1 was also executed starting from (±)-6. Three different syntheses of methyl (2E,4Z)-2,4-decadienoate (2), another component of the male pheromone of A. obtectus, were achieved by means of either palladium-catalyzed Heck reaction or a Claisen and an Al 2O3 catalyzed thermal rearrangements.
Synthesis of naturally occurring diene and trienes by Te/Li exchange on (1Z,3Z)-butyltelluro-4-methoxy-1,3-butadiene
Dabdoub, Miguel J.,Dabdoub, Vania B.,Baroni, Adriano C.M.,Hurtado, Gabriela R.,Barbosa, Sandro L.
experimental part, p. 1666 - 1670 (2010/05/19)
(1Z,3Z)-Butyltelluro-4-methoxy-1,3-butadiene 2 was obtained by the hydrotelluration of (Z)-1-methoxy-but-1-en-3-ynes 1. The butadienyllithium 3 obtained by the Te/Li exchange reaction in the (1Z,3Z)-1-butyltelluro-4-methoxy-1,3-butadiene 2 reacted with aldehydes to form the corresponding alcohols 4a-d with total retention of configuration. The alcohols formed undergo hydrolysis, resulting in the α,β,γ,δ-unsaturated aldehydes of (E,E) configuration, which are precursors of trienes obtained from natural sources. The products of this reaction were employed in the synthesis of methyl-(2E,4E)-decadienoate 7, which is a component of the flavor principles of ripe Bartlett pears. Performing the Wittig reaction of the methyl triphenylphosphorane with the deca-(2E,4E)-dienal 5a, we were able to synthesize the undeca-(1,3E,5E)-triene 6a. This compound is a sex-pheromone component of the marine brown algae Fucus serratus, Dictyopteris plagiograma, and Dictyopteris australis. Performing the Wittig reaction of methyl triphenylphosphorane with the octa-(2E,4E)-dienal 5c, the nona-(1,3E,5E)-triene 6b was synthesized. The compound obtained is a sex-pheromone component of the marine brown alga Sargassum horneri. The octa-(1,3E,5E)-triene 6c was easily obtained from hepta-(2E,4E)-dienal 5d by the Wittig reaction with methyl triphenylphophorane. This compound is a sex-pheromone component of the marine brown alga Fucus serratus.
Catalytic enantioselective allylation of dienals through the intermediacy of unsaturated π-allyl complexes
Zhang, Ping,Morken, James P.
supporting information; scheme or table, p. 12550 - 12551 (2010/01/30)
(Chemical Equation Presented) The nickel-catalyzed enantioselective addition of allylboronic acid pinacol ester [allylB(pin)] to >,β,γ,δ-unsaturated aldehydes is described. This reaction results in a remarkable inversion of substrate olefin geometry, providing the Z,E-configured reaction product in good enantioselectivity and olefin stereoselectivity. The reaction appears to proceed by conversion of the dienal to an unsaturated B-allyl complex followed by reductive elimination via transition state II. Enantioselectivities range from 73-94% ee for a range of δ-substituted dienals when chiral ligand L3 is employed.
Stereoselective synthesis of methyl and ethyl (2E,4Z)-2,4-decadienoates from (E)-4,4-dimethoxy-2-butenal
Ovanesyan,Garibyan,Badanyan
, p. 951 - 954 (2007/10/03)
Methyl and ethyl (2E,4Z)-2,4-decadienoates were synthesized starting from (E)-4,4-dimethoxy-2-butenal.
The preparation and electrocyclic ring-opening of cyclobutenes: Stereocontrolled approaches to substituted conjugated dienes and trienes
Binns, Falmai,Hayes, Roy,Hodgetts, Kevin J.,Saengchantara, Suthiweth T.,Wallace, Timothy W.,Wallis, Christopher J.
, p. 3631 - 3658 (2007/10/03)
Thermal electrocyclic ring-opening of 4-alkyl-2-cyclobutene-1-carbaldehydes occurs at low temperature to give (2Z,4E)-alkadienals exclusively, and the process is exploited in transforming cis-3-cyclobutene-1,2-dimethanol 1 into a variety of naturally occurring 1,3,5-alkatrienes and 2,4-decadienoates. Desymmetrisation of 1 with Pseudomonas fluorescens lipase gives access to both enantiomers of 3-oxabicyclo[3.2.0]hept-6-en-2-one 4, for use in stereocontrolled routes to 6-oxygenated (2Z,4E)-alkadienals.
Use of cis-3-cyclobutene-1,2-dimethanol in stereoselective routes to some naturally occurring conjugated dienes and trienes
Hodgetts, Kevin J.,Saengchantara, Suthiweth T.,Wallis, Christopher J.,Wallace, Timothy W.
, p. 6321 - 6324 (2007/10/02)
Thermal electronic ring-opening of 4-alkyl-2-cyclobutene-1-carbaldehydes occurs at low temperature to give (2Z,4E)-alka-2,4-dienals exclusively, and this process is exploited en route to various isomeric naturally occurring 1,3,5-alkatrienes and 2,4-decadienoates from a single precursor, cis-3-cyclobutene-1,2-dimethanol 4.
Synthesis of 2(E),4(E)-Dienamides and 2(E),4(E)-Dienoates from 1,3-Dienes via 2-Phenylsulfonyl 1,3-Dienes
Plobeck, Niklas A.,Baeckvall, Jan-E.
, p. 4508 - 4512 (2007/10/02)
A procedure for the preparation of 2E,4E unsaturated carboxylic acid derivatives from dienes was developed.Transformation of terminal 1,3-dienes to (E)-2-phenylsulfonyl 1,3-dienes and subsequent addition of a carboxy anion equivalent and elimination of benzenesulfinic acid led to 2,4-dienoic amides and esters.In this way the natural products N-isobutyl-2(E),4(E)-undecadienamide (1a), N-isobutyl-2(E),4(E)-decadienamide (pellitorine, 1b), and methyl 2(E),4(E)-decadienoate (1c) were obtained in high isomeric purity.
