Synthesis of allylamides from allyl halides, carbon monoxide, and titanium–nitrogen complexes prepared from molecular nitrogen
作者:Kazutaka Ueda、Miwako Mori
DOI:10.1016/j.tetlet.2004.02.072
日期:2004.3
4-Phenylbut-3-enamide could be synthesized from corresponding 3-chloroprop-2-enylbenzene, carbon monoxide (1 atm), and titanium–nitrogencomplexes, prepared from Ti(OiPr)4, Li, TMSCl, and molecularnitrogen (1 atm), using a palladium catalyst. The reaction proceeds viatransmetalation of the titanium–nitrogencomplex to an acylpalladium complex. PtBu3 as a ligand of the palladium catalyst, afforded
4-苯基丁-3-烯酰胺可以由相应的3-氯丙-2-基苯,一氧化碳(1 aTM)和钛-氮配合物合成,该配合物由Ti(O i Pr)4,Li,TMSCl和分子氮制备(1 aTM),使用钯催化剂。该反应通过钛-氮配合物的重金属化反应生成酰基铝配合物。P吨卜3作为钯催化剂的配体,得到了良好的结果,并且Li和的TMSCl的量影响酰胺的产率。当在氩气而不是一氧化碳的气氛下使用钯络合物上的二齿配体进行反应时,获得烯丙胺衍生物。
Synthesis of α,α-disubstituted amino acids based on tandem reaction of dehydroamino acid derivatives
作者:Hideto Miyabe、Ryuta Asada、Yoshiji Takemoto
DOI:10.1016/j.tet.2004.10.104
日期:2005.1
all-substituted sp3-hybridized carbon-center was investigated via tandem reaction of dehydroamino acid derivatives. The diethylzinc-promoted reaction of dehydroamino acid derivatives with acid anhydride or π-allylpalladium complex proceeded smoothly to afford α,α-disubstituted amino acids via a radical and anionic carbon–carbon bond-forming processes. The tandem reductive reaction of N-phthaloyl dehydroalanine
Nickel-Catalyzed C–H Coupling with Allyl Phosphates: A Site-Selective Synthetic Route to Linear Allylarenes
作者:Xuefeng Cong、Yuexuan Li、Yu Wei、Xiaoming Zeng
DOI:10.1021/ol501707z
日期:2014.8.1
reported that a nickel/phosphine catalyst allows the C–H allylation to occur effectively with the allyl site selectivity predominantly governed by steric effects. This reaction provides a facile and predictable route for the selective preparation of linear allylarenes from readily available benzamides and allyl phosphates.
The asymmetric synthesis of beta-substituted alpha-amino acids with use of iridium-catalyzedallylicsubstitution was described. The Ir-catalyzed allylicsubstitution of diphenylimino glycinate with allylic phosphates proceeded smoothly even at 0 degrees C and gave branch products with high enantioselectivity (up to 97% ee), when chiral bidentate phosphite bearing the 2-ethylthioethyl group was employed
Rapid and concise: The title reaction proceeds via copper complexes in a highly stereospecific manner (see scheme; acac=acetylacetonate, phen=1,10‐phenanthroline, TBS=tBuMe2Si). The catalysis provides a rapid and concise route to allylarenes that contain fluorinated aromatic cores of an electron‐deficient nature.
快速简明:标题反应以高度立体定向的方式通过铜络合物进行(参见方案; acac =乙酰丙酮酸酯,phen = 1,10-菲咯啉,TBS = t BuMe 2 Si)。催化作用提供了一条快速而简明的途径,以得到含有电子不足性质的氟化芳族核的烯丙基芳烃。