Rhodium-Catalyzed Successive C–H Bond Functionalizations To Synthesize Complex Indenols Bearing a Benzofuran Unit
作者:Yan-Le Mei、Wei Zhou、Tao Huo、Fang-Shuai Zhou、Jing Xue、Guang-Yi Zhang、Bing-Tao Ren、Cheng Zhong、Qing-Hai Deng
DOI:10.1021/acs.orglett.9b03766
日期:2019.12.6
efficient rhodium-catalyzed redox-neutral annulations of N-phenoxyacetamides and ynones via successive double C-H bond activations has been developed. A series of novel and complex indenols bearing a benzofuran unit were generated with moderate to excellent regioselecetivities undermildconditions. Adding N-ethylcyclohexanamine (CyNHEt) could restrict the formation of the mono C-H bond activation byproduct
The flow thermolyses of 1-isobutenyl alkynyl- and 2-methylphenyl alkynyl ketones. Synthesis of methylenomycin B
作者:Manuel Roller、Martin Karpf、André S. Dreiding
DOI:10.1016/s0040-4039(00)83928-3
日期:1986.1
lead to phenols and to cyclopentenones. The results are explained by a 5-ring carbene process (the known α-alkynone cyclization) and a 6-ring as well as a 5-ring addition process. The latter two (novel) processes are thought to be intramolecular “CH to CC additions” in two directions. The 5-ring addition process was used in a short (but low yield) synthesis of methylenomycinB.