cobalt(III)-catalyzed, redox-neutral, intermolecular carboamination of propiolates and bicyclic alkenes was developed. This non-annulative coupling strategy features atom economy, high regioselectivity, good yields, and functional groups tolerance. Such a carboamination reaction was applied to modified phenolsfrom the corresponding phenols under mild conditions.
Direct Conversion of Haloarenes to Phenols under Mild, Transition-Metal-Free Conditions
作者:Patrick S. Fier、Kevin M. Maloney
DOI:10.1021/acs.orglett.6b00876
日期:2016.5.6
as the hydroxide source via a novel SNAr reaction/Lossen rearrangement sequence. Notably, these reactions employ inexpensive and air-stable reagents, require no special handling, occur under mildly basic conditions, and form products in high yields in the presence of electrophilic and protic functionality. The utility of this methodology is demonstrated by the high-yielding hydroxylation of two base-sensitive
Rhodium(III)-Catalyzed C–H Olefination for the Synthesis of <i>ortho</i>-Alkenyl Phenols Using an Oxidizing Directing Group
作者:Yangyang Shen、Guixia Liu、Zhi Zhou、Xiyan Lu
DOI:10.1021/ol4014188
日期:2013.7.5
By using an oxidizing directinggroup, a mild, efficient Rh(III) catalyzed C–H olefination reaction between N-phenoxyacetamides and alkenes was developed. This reaction provided a straightforward way for the synthesis of ortho-alkenyl phenols, and the directinggroup is traceless in the product.
Cascade Synthesis of 3-Alkylidene Dihydrobenzofuran Derivatives via Rhodium(III)-Catalyzed Redox-Neutral C–H Functionalization/Cyclization
作者:Zhi Zhou、Guixia Liu、Yan Chen、Xiyan Lu
DOI:10.1021/acs.orglett.5b03060
日期:2015.12.4
An efficient rhodium(III)-catalyzed coupling reaction of N-phenoxyacetamides with propargyl carbonates to yield 3-alkylidene dihydrobenzofuran derivatives via C–H functionalization/cascade cyclization has been developed. This transformation represents a redox-neutral process and features the formation of three new bonds under mild conditions.
Metal‐Free [3,3]‐Sigmatropic Rearrangement/[3+2] Annulation Cascade of
<i>N</i>
‐Phenoxy Amides with Terminal Alkynes for the Diastereoselective Synthesis of
<i>trans</i>
‐Dihydrobenzofurans
作者:Fu‐Xiaomin Liu、Weijie Chen、Guoxun Zhu、Zhi Zhou、Hui Gao、Wei Yi
DOI:10.1002/adsc.201900527
日期:2019.9.3
An efficient synthetic route for the diastereoselectiveconstruction of trans‐dihydrobenzofurans via cascade [3,3]‐sigmatropic rearrangement/[3+2] annulation sequences has been developed. This protocol represents a metal‐free transformation of the promising N‐phenoxy amides with terminal alkynes and features mild conditions, good functional group compatibility, and practical synthetic potential.