Synthesis of Spirocyclic Diarylfluorenes by One-Pot Twofold S<sub>N</sub>Ar Reactions of Diaryl Sulfones with Diarylmethanes
作者:M. Bhanuchandra、Hideki Yorimitsu、Atsuhiro Osuka
DOI:10.1021/acs.orglett.5b03384
日期:2016.2.5
tetraarylmethanes in a single operation. The transformation would proceed via an intermolecular SNAr reaction of the dioxides with cyclic diarylmethylpotassium followed by intramolecular SNAr cyclization. This straightforward strategy provides a wide range of spirocyclic diarylfluorenes including unusual ones that are otherwise difficult to synthesize.
在KN(SiMe 3)2存在下用环状二芳基甲烷处理二苯并噻吩二氧化物导致在单个操作中形成芴基螺环四芳基甲烷。所述转化将通过二氧化物与环状二芳基甲基钾的分子间S N Ar反应,然后进行分子内S N Ar环化而进行。这种简单的策略可提供多种螺环二芳基芴,包括难于合成的不寻常的螺环。