Highly Site Selective Formal [5+2] and [4+2] Annulations of Isoxazoles with Heterosubstituted Alkynes by Platinum Catalysis: Rapid Access to Functionalized 1,3-Oxazepines and 2,5-Dihydropyridines
作者:Wen-Bo Shen、Xin-Yu Xiao、Qing Sun、Bo Zhou、Xin-Qi Zhu、Juan-Zhu Yan、Xin Lu、Long-Wu Ye
DOI:10.1002/anie.201610042
日期:2017.1.9
Platinum‐catalyzed formal [5+2] and [4+2] annulations of isoxazoles with heterosubstituted alkynes enabled the atom‐economical synthesis of valuable 1,3‐oxazepines and 2,5‐dihydropyridines, respectively. Importantly, this Pt catalysis not only led to unique reactivity dramatically divergent from that observed under Au catalysis, but also proceeded via unprecedented α‐imino platinum carbene intermediates
Studies on the palladium-catalysed direct alkenylation of 1,2-azoles
作者:Ben Chappell、Nathan Dedman、Simon Wheeler
DOI:10.1016/j.tetlet.2011.04.051
日期:2011.6
Electron-rich isoxazoles, isothiazoles and pyrazoles undergo palladium-catalysed direct alkenylation in moderate yields. (C) 2011 Elsevier Ltd. All rights reserved.
Yamanaka, Hiroshi; Shiraiwa, Masafumi; Yamamoto, Etsuko, Chemical and pharmaceutical bulletin, 1981, vol. 29, # 12, p. 3543 - 3547