1,3-二烯基-2-硼酸酯的新颖路线提供了共轭[ E,E ]-二烯和共轭[ E ]-烯酮的简单合成。
摘要:
[ E ] -2-(1'-[ E ]-烯基取代的-1'-烯基)-1,3,2-二氧杂硼烷酮的高度立体和区域选择性合成是通过[ Z ]-(1-溴-1-烯基)硼酸酯与[ E ] -1-锂硫基-1-烯烃。这些是新颖的硼中间体,可以高收率和出色的立体化学纯度将其转化为共轭[ E,E ]-二烯和共轭[ E ]-烯酮。
Nickel- or palladium-catalyzed cross coupling. 31. Palladium- or nickel-catalyzed reactions of alkenylmetals with unsaturated organic halides as a selective route to arylated alkenes and conjugated dienes: scope, limitations, and mechanism
作者:Eiichi Negishi、Tamotsu Takahashi、Shigeru Baba、David E. Van Horn、Nobuhisa Okukado
DOI:10.1021/ja00242a024
日期:1987.4
Al, Zr, and Zn were 2, 3, and > 2000 mmol of (E)-1-octenylbenzene (8) per mmol of Pd(PPh/sub3/)/sub 4/ per hour at room temperature, respectively. The stoichiometric reaction of PhPd(PPh/sub3/)/sub 2/I (6) with 1.2 equiv of (E)-1-octenylzinc chloride (7) in a 2:1 mixture of CD/sub 2/Cl/sub2/ and THF was examined in detail. The reaction follows second-order kinetics (k/sub2/ = 2.9 L/(mol.min) at
The palladium-catalyzed “head-to-tail” cross-coupling reaction of 1-alkenylboranes with phenyl or 1-alkenyl iodides. A novel synthesis of 2-phenyl-1-alkenes or 2-alkyl-1,3-alkadienes via organoboranes
作者:Norio Miyaura、Akira Suzuki
DOI:10.1016/s0022-328x(00)82970-8
日期:1981.6
The reaction of phenyl or 1-alkenyl iodides with 1-alkenyl-1,3,2-benzodioxaboroles readily obtainable via the hydroboration of 1-alkynes, gives the corresponding “head-to-tail” cross-coupling products, 2-phenyl-1-alkenes or 2-alkyl-1,3-alkadienes, in good yields. The reaction is effectively catalyzed by catalytic amounts of palladium compounds in the presence of triethylamine.
Polymer-bound palladium-catalyzed cross-coupling of organoboron compounds with organic halides and organic triflates
作者:Su-Bum Jang
DOI:10.1016/s0040-4039(97)00171-8
日期:1997.3
The polymer-bound palladium-catalyzedcross-couplingreaction of electrophiles(i.e., halides and triflates) with organoboron compounds to form carbon-carbon bonds was achieved at mild conditions with very high activity in the Suzuki coupling reaction. The polymeric catalyst can be easily separated from a reaction mixture and reused more than 10 times with no decrease in activity
The reaction of Cl2Pd(PEt3)2 with 2 equiv of (E)-t-BuCHCHLi, t-BuCCLi, or MeLi gives the corresponding R12Pd(PEt3)2 in a nearly quantitative yield without producing R1R1, where R1 = (E)-t-BuCHCH, t-BuCC, or Me. The reaction of PhLi or PhZnCl gives Ph2Pd(PEt3)2 and biphenyl in approximately 90 and 10% yields, respectively. On the other hand, the corresponding reaction of Cl2Pd(PPh3)2 produces R1R1
A new stereospecific cross-coupling by the palladium-catalyzed reaction of 1-alkenylboranes with 1-alkenyl or 1-alkynyl halides
作者:Norio Miyaura、Kinji Yamada、Akira Suzuki
DOI:10.1016/s0040-4039(01)95429-2
日期:1979.1
3,2-benzodioxaboroles readily obtainable via hydroboration of 1-alkynes react with 1-alkenyl halides or 1-alkynyl halides in the presence of a catalytic amount of tetrakis(triphenylphosphine)palladium and base to give corresponding conjugated (E)-dienes or (E)-enynes with high regio- and stereospecificity in good yields, respectively.