Alumina-Catalyzed Addition of Thiols to Methyl Propiolate
作者:Mitsuo Kodomari、Goroh Saitoh、Suehiko Yoshitomi
DOI:10.1246/bcsj.64.3485
日期:1991.11
The addition of thiols to methylpropiolate was remarkably accelerated in the presence of alumina to give the Z-isomer of the 1:1 adducts stereoselectively, in which alumina acts as a bifunctional catalyst of acid and base.
Triphenylphosphine-Catalyzed Stereoselective Synthesis of Alkyl 3-(2-Naphthylsulfanyl)-2-propenoate from Alkyl Acetylenecarboxylates and 2-Naphthalenethiol
作者:Ali Ramazani、Sadegh Salmanpour、Issa Amini
DOI:10.1080/10426500802266126
日期:2009.3.10
Protonation of the highly reactive 1:1 intermediates, produced in the reaction between triphenylphosphine and alkyl acetylenecarboxylates by 2-naphthalenethiol, leads to vinyltriphenylphosphonium salts, which undergo an addition-elimination reaction to produce the corresponding S-vinyl thioethers. The NMR spectra indicated that the compounds contained two stereoisomers for each S-vinyl thioether; their ratio was determined on the basis of 1H NMR spectra. The reaction is fairly stereoselective.