Cp*Co(III)‐Catalyzed
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‐Amidation of Benzaldehydes with Dioxazolones Using Transient Directing Group Strategy
作者:Bhuttu Khan、Vikas Dwivedi、Basker Sundararaju
DOI:10.1002/adsc.201901267
日期:2020.3.4
metal‐catalyzed ortho‐selective C(sp2)−H amidation of weakly coordinating aldehydes remains limited to precious metals such as Ir, Rh, Ru, etc. Herein, we put forward a novel report on ortho‐amidation of benzaldehydes employing user‐friendly dioxazolones under cost‐effective and air‐stable Cp*Co(III) catalysis. This catalytic transformation involves transient directing group strategy to enhance the ligating
KOtBu-mediated stereoselective addition of quinazolines to alkynes under mild conditions
作者:Dan Zhao、Qi Shen、Yu-Ren Zhou、Jian-Xin Li
DOI:10.1039/c3ob41083h
日期:——
A facile alkenylation of quinazolines with unactivated terminal alkynes has been achieved in the presence of KOtBu without the aid of any transition metal catalysts. The reaction is carried out under very mild conditions and shows a high stereoselectivity. A possible radical-based mechanism is also explored.