Synthesis of Benzyltributylstannanes by the Reaction of <i>N</i>-Tosylhydrazones with Bu<sub>3</sub>SnH
作者:Di Qiu、Shuai Wang、He Meng、Shengbo Tang、Yan Zhang、Jianbo Wang
DOI:10.1021/acs.joc.6b02639
日期:2017.1.6
An efficient stannylation process with Ntosylhydrazones or directly with carbonyl compounds has been developed. A series of functionalized benzyl-and alkyltributylstannanes can be synthesized in moderate to good yields under transition-metal-free conditions. Tandem transformations involving stannylation/Stille cross-coupling reaction have been carried out without purification of the benzyltributylstannane intermediates to afford a series of diarylmethane derivatives.
Controlled Anion Migrations with a Mixed Metal Li/K-TMP Amide: General Application to Benzylic Metalations
作者:Patricia Fleming、Donal F. O’Shea
DOI:10.1021/ja110234v
日期:2011.2.16
A general method is described for benzylic metalation of o-, m-, and p-substituted toluenes using a mixed metal amide base generated from BuLi/KOtBu/TMP at -78 degrees C in THF. The excellent selectivity achieved can be rationalized by the ability of the mixed metal amide base to facilitate an anion migration from the kinetic (o-aryl) to the benzylic metalation site. Remarkably, this controlled anion migration is achievable with catalytic amounts of TMP at -78 degrees C.