Design and Application of New Imidazolylsulfonate-Based Benzyne Precursor: An Efficient Triflate Alternative
作者:Szabolcs Kovács、Ádám I. Csincsi、Tibor Zs. Nagy、Sándor Boros、Géza Timári、Zoltán Novák
DOI:10.1021/ol300529j
日期:2012.4.20
cycloadditions involving benzyne intermediates. The precursor offers an efficient alternative for generating benzynes compared to widely used ortho TMS triflates under similar reaction conditions. With the utilization of this new precursor, the formation of potentially genotoxic trifluoromethanesulfonate side product is eliminated. The applicability of the new benzyneprecursor was demonstrated in different
Lewis Base‐Catalyzed Cycloaddition of Heterocyclic Alkenes with 2,2,2‐Trifluorodiazoethane (CF
<sub>3</sub>
CHN
<sub>2</sub>
): Access to Trifluoromethylated Pyrazolines and Pyrazoles
作者:Tingting Cao、Zhen Yang、Yunfang Sun、Nannan Zhao、Shan Lu、Jing Zhang、Lei Wang
DOI:10.1002/ejoc.202100521
日期:2021.6.7
An efficient Lewis base catalytic protocol to biologically important trifluoromethylated pyrazolines and pyrazoles is developed through [3+2] triazene-heterocycilc alkene cycloaddition reactions of an array of oxa-/aza-benzonorbornadienes and coumarins with CF3CHN2. This approach features good functional group tolerance and scaffold diversity. Synthetic utility of the protocol is highlighted by late-stage