Tandem rearrangement, cyclization and aromatization of sulfur bridged propargylic systems
作者:Samuel Braverman、Yossi Zafrani、Hugo E Gottlieb
DOI:10.1016/s0040-4039(00)00221-5
日期:2000.4
The reactivity of some novel pi-conjugated bis-propargylic sulfides, sulfoxides and sulfones under basic conditions has been investigated. These compounds undergo isomerization to the corresponding diallenes, followed by a tandem cyclization and aromatization of the latter via a diradical intermediate. Surprisingly, we have found that the rate of the cyclization step was independent of the nature of the bridging functionality. (C) 2000 Elsevier Science Ltd. All rights reserved.