Multicomponent Reactions Involving 2-Methyleneaziridines: Rapid Synthesis of 1,3-Disubstituted Propanones
作者:Jerome F. Hayes、Michael Shipman、Heather Twin
DOI:10.1021/jo016164v
日期:2002.2.1
metalloenamine (metalated imine) intermediate in a regiocontrolled manner. The sequential formation of two new intermolecular carbon-carbon bonds in this reaction provides a rapid entry into a variety of 1,3-disubstituted propan-2-ones, including 11 and 14-23. The scope and mechanism of this multicomponent reaction (MCR) has been assessed. It is established that this MCR tolerates alkyl, aryl, and benzylic Grignard
Intramolecular carbolithiation promoted by a DTBB-catalysed chlorine–lithium exchange
作者:Miguel Yus、Rosa Ortiz、Fernando F Huerta
DOI:10.1016/j.tet.2003.09.012
日期:2003.10
The reaction of 6-chlorohex-1-ene 1 with lithium powder and a catalytic amount of 4,4′-di-tert-butylbiphenyl (DTBB, 5% molar) in THF at −78°C gives the corresponding organolithium intermediate 2, which by reaction with different electrophiles affords, after hydrolysis with diluted hydrochloric acid, the expected products 3. The same reaction performed at −30°C gives cyclopentyl derivatives 5, probably
A Simple Stereoselective Synthesis of Enantiopure 2-Substituted Pyrrolidines and Piperidines from Chiral (R)-Phenylglycinol-Derived Bicyclic 1,3-Oxazolidines
作者:José M. Andrés、Ignacio Herráiz-Sierra、Rafael Pedrosa、Alfonso Pérez-Encabo
Chiral, nonracemic 2-substituted pyrrolidines and piperidines were prepared in high ee and moderate to good chemical yields in three steps from (R)-phenylglycinol and γ- or δ-chloroketones. The key step of the synthesis was the stereoselective reductive ring-opening of chiral bicyclic 1,3-oxazolidines prepared by condensation of (R)-phenylglycinol and the corresponding ketones.
手性、非外消旋的 2-取代吡咯烷和哌啶通过三个步骤从 (R)-苯基甘氨醇和 γ-或 δ-氯酮以高 ee 和中等至良好的化学产率制备。合成的关键步骤是通过 (R)-苯基甘氨醇和相应的酮缩合制备的手性双环 1,3-恶唑烷的立体选择性还原开环。
Vaultier, M.; Lambert, P. H.; Carrie, R., Bulletin de la Societe Chimique de France, 1986, # 1, p. 83 - 92
作者:Vaultier, M.、Lambert, P. H.、Carrie, R.
DOI:——
日期:——
VAULTIER, M.;LAMBERT, P. H.;CARRIE, R., BULL. SOC. CHIM. FR., 1986, N 1, 83-92