The First Aryne Evolution from the Reactions of Selenonium Salts with Aryllithiums
作者:Shin-ichi Watanabe、Keiichirou Yamamoto、Yukiko Itagaki、Tatsunori Iwamura、Tetsuo Iwama、Tadashi Kataoka
DOI:10.1016/s0040-4020(99)01090-x
日期:2000.2
The first example of the benzyne generation was found in the reactions of alkynylselenonium salt 1a with 1.0 equiv. of phenyllithium in THF at room temperature for 3 h. The formation of the aryne intermediate was confirmed in the reactions of alkynylselenonium salt 1b and tri-p-tolylselenonium salt 6b with tolyllithium, which gave a mixture of alkynylbiphenyl derivatives 18 and 19 in 19% yield (18:19=11:8) and a mixture of bitolyls 28 and 29 in 63% yield (28:29=2:1), respectively. The reaction mechanisms of these reactions are discussed. (C) 2000 Elsevier Science Ltd. All rights reserved.