and the pinacolboronates can be isolated after reaction of the benzylboronic acid with pinacol. The metholodogy has been applied to the reactions of alkylboronic acids with N-tosylhydrazones of aromaticaldehydes and ketones, and to the reactions of arylboronic acids with N-tosylhydrazones of aliphatic ketones. Moreover, the employment of the DBU/DIPEA bases combination allows for homogeneous reactions
Intramolecular cycloaddition reactions of olefinic tosylhydrazones
作者:Albert Padwa、Hao Ku
DOI:10.1021/jo01307a008
日期:1980.9
Cu-Mediated Sulfonyl Radical-Enabled 5-<i>exo-trig</i> Cyclization of Alkenyl Aldehydes: Access to Sulfonylmethyl 1<i>H</i>-Indenes
作者:Jiabin Ni、Yu Xue、Liping Sun、Ao Zhang
DOI:10.1021/acs.joc.8b00341
日期:2018.4.20
An efficient method for the construction of sulfonylmethyl 1H-indenes via Cu(I)-mediated sulfonyl radical-enabled 5-exo-trigcyclization of alkenyl aldehydes has been developed for the first time. Mechanistic studies indicated that a radical addition–cyclization–elimination (RACE) process might be involved. The reaction features a relatively broad substrate scope, good annulation efficiency, and varying
Rhodium(II)- or Copper(I)-Catalyzed Formal Intramolecular Carbene Insertion into Vinylic C(sp<sup>2</sup>
)−H Bonds: Access to Substituted 1<i>H</i>
-Indenes
作者:Qi Zhou、Shichao Li、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201709375
日期:2017.12.11
A rhodium(II)‐ or copper(I)‐catalyzed formal intramolecular carbene insertion into vinylic C(sp2)−H bonds is reported herein. This method provides straightforward access to 1H‐indenes with high efficiency and excellent functional‐group compatibility. Mechanistically, the reaction is proposed to involve the following sequence: metal carbene formation, intramolecular nucleophilic addition of the double