Stereospecific Nucleophilic Substitution of Enantioenriched Tertiary Benzylic Amines via in Situ Activation with Benzyne
作者:Yang Gui、Shi-Kai Tian
DOI:10.1021/acs.orglett.7b00365
日期:2017.4.7
A one-pot protocol has been developed for sequential benzyne activation and nucleophilicsubstitution of enantioenriched tertiary benzylic amines. In the presence of 2-(trimethylsilyl)phenyl triflate and CsF, a range of enantioenriched tertiary benzylic amines were substituted by various nucleophiles, delivering structurally diverse benzylic compounds in moderate to excellent yields with excellent
Triflic Acid Catalyzed Reductive Coupling Reactions of Carbonyl Compounds with O-, S-, and N-Nucleophiles
作者:Beate A. Gellert、Nils Kahlcke、Markus Feurer、Stefanie Roth
DOI:10.1002/chem.201101819
日期:2011.10.17
Highly efficient metal‐free reductivecoupling reactions of aldehydes and ketones with a range of nucleophiles in the presence of triflic acid (1–5 mol %) as the catalyst are presented. The reactions can be performed at ambient temperature without exclusion of moisture or air. A range of symmetrical and unsymmetrical ethers were obtained by this method in high yields and short reaction times. For the
protic solvent (methanol) these sulfides give the sulfoxides instead (except for the nitrobenzyl derivatives, where the aldehyde remains the major product). Among the α-substituted sulfides tested, the α-phenylbenzyl and the 3-cyclohexenyl sulfide give the corresponding ketone (the latter in a low yield), but the α-methylbenzyl sulfide gives the sulfoxide as the main product. The rate for singlet oxygen
Reaction of singlet oxygen with some benzylic sulfides
作者:Sergio M. Bonesi、Maurizio Fagnoni、Sandra Monti、Angelo Albini
DOI:10.1016/j.tet.2006.07.110
日期:2006.11
Product distribution, total quenching rate (kT), and rate of chemical reaction (kr) with singlet oxygen have been determined for some alkyl, benzyl, α-methylbenzyl, and cumyl sulfides. Their contributions depend on the steric hindering around the sulfur atom. In protic solvents, the sulfoxide is the main product via a hydrogen-bonded persulfoxide. In apolar solvents, intramolecular α-H abstraction
Hemin promotes the Markovnikov-type addition reactions of thiols (origins of the thiols are their disulfide derivatives) to styrene in benzene–ethanol (1:1) containing NaBH4. The plausible reaction mechanism has been discussed.