Synthesis of Terminal Allenes through Copper-Mediated Cross-Coupling of Ethyne withN-Tosylhydrazones or α-Diazoesters
摘要:
Ethyne is employed as coupling partner in copper-mediated cross-coupling reactions with N-tosylhydrazones and alpha-diazoacetate, leading to the development of a new synthetic method for terminal allenes. With this novel coupling method, the terminal allenes were obtained in good yields and with excellent functional group tolerance. Copper carbene migratory insertion is proposed as the key step in these transformations.
Palladium-Catalyzed Diarylmethyl C(sp<sup>3</sup>)–C(sp<sup>2</sup>) Bond Formation: A New Coupling Approach toward Triarylmethanes
作者:Ying Xia、Fangdong Hu、Zhenxing Liu、Peiyuan Qu、Rui Ge、Chen Ma、Yan Zhang、Jianbo Wang
DOI:10.1021/ol400690t
日期:2013.4.5
Palladium-catalyzed reductive coupling reactions between N-tosylhydrazones and aryl halides lead to the formation of C(sp(3))-C(sp(2)) bonds. This approach provides a general route for the synthesis of triarylmethanes.