16939-57-4Relevant articles and documents
A convenient method for the synthesis of terminal (E)-1,3-dienes
Wang,West
, p. 99 - 103 (2002)
Lithiated allylic phosphonates undergo efficient olefination reactions with a variety of aldehydes in the presence of HMPA to give terminal 1,3-dienes with high selectivity for the E-isomer. This method is general and procedurally simple.
Catalyst Controlled Regiodivergent Arylboration of Dienes
Sardini, Stephen R.,Brown, M. Kevin
, p. 9823 - 9826 (2017)
A method for the regiodivergent arylboration of dienes is presented. These reactions allow for the formation of a diverse range of synthetically versatile products from simple precursors. Through mechanistic studies, these reactions likely operate by init
A STEREO- AND REGIO-SPECIFIC ADDITION OF ν3-TRIMETHYLSILYLALLYLTITANIUM COMPOUND WITH ALDEHYDES. A FACILE AND STEREOCONTROLLED SYNTHESIS OF E- AND Z-TERMINAL DIENES
Sato, Fumie,Suzuki, Yoshito,Sato, Masao
, p. 4589 - 4592 (1982)
ν3-Trimethylsilylallyltitanium compound, (ν5-C5H5)2Ti(ν3-1-trimethylsilylallyl), reacts with aldehydes to give (+/-)-(R,S)-3-trimethylsilyl-4-hydroxy-1-alkenes in excellent yields, which can be deoxysilylated to either E- or Z-1,3-dienes.
Copolymerization of 1,3-butadiene with phenyl/phenethyl substituted 1,3-butadienes: a direct strategy to access pendant phenyl functionalized polydienes
Li, Dexin,Lin, Juan,Liu, Heng,Wang, Feng,Zhang, Chunyu,Zhang, Xuequan
, p. 23184 - 23191 (2021)
Copolymerization of 1,3-butadiene with various types of phenyl substituted 1,3-butadiene derivatives, including (E)-1-phenyl-1,3-butadiene (PBD), 1-phenethyl-1,3-butadiene (PEBD), 1-(4-methoxylphenyl)-1,3-butadiene (p-MEPBD), 1-(2-methoxylphenyl)-1,3-buta
Synthesis and heck reactions of ethenyl- and (Z)-butadien-1-yl nonaflate obtained by the fragmentation of furan derivatives
Lyapkalo, Ilya M.,Webel, Matthias,Reissig, Hans-Ulrich
, p. 4189 - 4194 (2001)
The nonaflation of lithium enolates or of silyl enol ethers, formally derived from acetaldehyde or crotonaldehyde, with nonafluorobutanesulfonyl fluoride gave ethenyl nonaflate (1b) and (Z)-buta-1,3-dien-1-yl nonaflate (2) in good yields. The required enolates were obtained by aldehyde-free routes by the lithiation of tetrahydrofuran or 2,5-dihydrofuran followed by the cyclofragmentation of the metallated heterocycles. The application of this approach to the synthesis of allenyl nonaflate 3 failed, presumably due to the intrinsic instability of this allene derivative. The nonaflates 1b and 2 were also prepared by the fluoride-catalysed reaction of the corresponding silyl enol ethers 5 and 7 with nonafluorobutanesulfonyl fluoride; however, the overall yields are slightly lower for these two-step pathways. The cyclofragmentation of lithiated 2,2-dimethyl-4-methylene-[1,3]dioxolane allowed the easy preparation of trimethylsiloxyallene (10) in moderate yield. The nonaflates 1b and 2 reacted smoothly with monosubstituted alkenes in the presence of a catalytic amount of palladium(II) acetate to give the anticipated Heck coupling products in good to moderate yields and with high stereoselectivities.
A Diverted Aerobic Heck Reaction Enables Selective 1,3-Diene and 1,3,5-Triene Synthesis through C-C Bond Scission
McAlpine, Neil J.,Wang, Long,Carrow, Brad P.
, p. 13634 - 13639 (2018)
Substituted 1,3-dienes are valuable synthetic intermediates used in myriad catalytic transformations, yet modern catalytic methods for their preparation in a highly modular fashion using simple precursors are relatively few. We report here an aerobic boron Heck reaction with cyclobutene that forms exclusively linear 1-aryl-1,3-dienes using (hetero)arylboronic acids, or 1,3,5-trienes using alkenylboronic acids, rather than typical Heck products (i.e., substituted cyclobutenes). Experimental and computational mechanistic data support a pericyclic mechanism for C-C bond cleavage that enables the cycloalkene to circumvent established limitations associated with diene reagents in Heck-type reactions.
Dynamic kinetic resolution of acyclic allylic acetates using lipase and palladium
Choi, Yoon Kyung,Suh, Jong Hwa,Lee, Donghyun,Lim, In Taek,Jung, Jae Yoon,Kim, Mahn-Joo
, p. 8423 - 8424 (1999)
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Site-Selective Acceptorless Dehydrogenation of Aliphatics Enabled by Organophotoredox/Cobalt Dual Catalysis
Zhou, Min-Jie,Zhang, Lei,Liu, Guixia,Xu, Chen,Huang, Zheng
supporting information, p. 16470 - 16485 (2021/10/20)
The value of catalytic dehydrogenation of aliphatics (CDA) in organic synthesis has remained largely underexplored. Known homogeneous CDA systems often require the use of sacrificial hydrogen acceptors (or oxidants), precious metal catalysts, and harsh reaction conditions, thus limiting most existing methods to dehydrogenation of non- or low-functionalized alkanes. Here we describe a visible-light-driven, dual-catalyst system consisting of inexpensive organophotoredox and base-metal catalysts for room-temperature, acceptorless-CDA (Al-CDA). Initiated by photoexited 2-chloroanthraquinone, the process involves H atom transfer (HAT) of aliphatics to form alkyl radicals, which then react with cobaloxime to produce olefins and H2. This operationally simple method enables direct dehydrogenation of readily available chemical feedstocks to diversely functionalized olefins. For example, we demonstrate, for the first time, the oxidant-free desaturation of thioethers and amides to alkenyl sulfides and enamides, respectively. Moreover, the system's exceptional site selectivity and functional group tolerance are illustrated by late-stage dehydrogenation and synthesis of 14 biologically relevant molecules and pharmaceutical ingredients. Mechanistic studies have revealed a dual HAT process and provided insights into the origin of reactivity and site selectivity.
Synergistic Pd/Amine-Catalyzed Stereodivergent Hydroalkylation of 1,3-Dienes with Aldehydes: Reaction Development, Mechanism, and Stereochemical Origins
Wang, Hongfa,Zhang, Qinglong,Zhang, Ruiyuan,Zi, Weiwei
supporting information, p. 10948 - 10962 (2021/08/03)
Metal-hydride-catalyzed hydroalkylation of 1,3-dienes with enolizable carbonyl compounds is an atom- and step-economical method for preparing chiral molecules with allylic stereocenters. Although high diastereo- and enantioselectivities have been achieved
