Stereoselective Modification of <i>N</i>-(α-Hydroxyacyl)-glycinesters via Palladium-Catalyzed Allylic Alkylation
作者:Alexander Horn、Uli Kazmaier
DOI:10.1021/acs.orglett.9b01497
日期:2019.6.21
excellent nucleophiles in Pd-catalyzed allylic alkylation. The method allows for the stereoselective introduction of a wide range of side chains, including highly functionalized ones. Both diastereomers can be accessed through variation of the reaction conditions. Furthermore, the use of stannylated carbonates introduces vinylstannane motifs, which are eligible for subsequent C–C coupling reactions.
Indium-Catalyzed Annulation of 2-Aryl- and 2-Heteroarylindoles with Propargyl Ethers: Concise Synthesis and Photophysical Properties of Diverse Aryl- and Heteroaryl-Annulated[<i>a</i>]carbazoles
is applicable also to symmetrical dimers such as bithiophene and bifuran derivatives. Mechanisticstudies suggest that the first step is addition reaction initiated by regioselective nucleophilic attack of the C3 of 2-aryl- and 2-heteroarylindoles to the internal carbon atom of the C[triple bond]C bond in propargyl ethers. The next stage is ring-closing S(N)2 process kicking out the alkoxy group and
Highly efficient synthesis of propargyl- and allenyltitanium reagents from propargyl halides or propargyl alcohol derivatives. Practical synthesis of allenyl and homopropargyl alcohols
作者:Takashi Nakagawa、Aleksandr Kasatkin、Fumie Sato
DOI:10.1016/0040-4039(95)00514-d
日期:1995.5
Reaction of Ti(O-i-Pr)4/2 i-PrMgBr, synthetic equivalent of practical Ti(II) reagent, with propargylhalides or propargyl alcohol derivatives affords allenyl titanium compounds in excellent yields, thus providing an efficient and practical method for synthesis of both allenyl and homopropargyl alcohols by the successive treatment with aldehydes or ketones.
Titanium/Palladium-Mediated Regioselective Propargylation of Ketones using Propargylic Carbonates as Pronucleophiles
作者:Alba Millán、Luis Álvarez de Cienfuegos、Ana Martín-Lasanta、Araceli G. Campaña、Juan M. Cuerva
DOI:10.1002/adsc.201000655
日期:2011.1.10
for the synthesis of homopropargylic alcohols usingpropargyliccarbonates as pronucleophiles is reported. The reaction is based on a combination of transition metal (palladium) and radical chemistry (titanium). The reaction takes place with an excellent regioselectivity and tolerates a great degree of substitution of the starting propargyliccarbonate, thus being an interesting tool in the context
One-Pot Synthesis of a Variety of 1,4-Alkadienes and 1,2,4-Alkatrienes from Alkynes, Allyl, or Propargyl Compounds and Electrophiles by a (η2-Propene)Ti(O-i-Pr)2-Mediated Reaction
作者:Sentaro Okamoto、Yuuki Takayama、Yuan Gao、Fumi Sato
DOI:10.1055/s-2000-6296
日期:——
The intermolecular reaction of alkynes with allyl or propargyl compounds mediated by (η2-propene)Ti(O-i-Pr)2 followed by trapping of the resulting vinyltitanium compounds with an electrophile such as H2O, I2 or an aldehyde furnished a variety of 1,4-alkadienes or 1,2,4-alkatrienes.