Highly Selective Thioselenation of Vinylcyclopropanes with a (PhS)(2)-(PhSe)(2) Binary System and Its Application to Thiotelluration.
A novel, highly selective method for introducing organic sulfur, selenium, and tellurium functions into vinylic cyclopropanes has been developed on the basis of the relative reactivities of organic dichalcogenides and chalcogen-centered radicals. Upon irradiation with the light of wavelength over 300 nm, the reaction of vinylcyclopropanes with diphenyl disulfide and diphenyl diselenide proceeds smoothly to provide the corresponding gamma-(selenoethyl)allylic sulfides regioselectively in good yields. Similarly, vinylcyclopropanes undergo regioselective thiotelluration by use of a novel (PhS)(2)-(PhTe)(2) binary system, affording the corresponding ring-opened thiotelluration product in good yields. Furthermore, the scope and limitations of this (PhS)(2)-(PhTe)(2) binary system are discussed.
Ogawa
Akiya
A
Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan.
Ogawa
Ikuko
I
Obayashi
Ryoichi
R
Umezu
Keita
K
Doi
Mikio
M
Hirao
Toshikazu
T