Saturated oxygen and nitrogen heterocycles <i>via</i> oxidative coupling of alkyltrifluoroborates with alkenols, alkenoic acids and protected alkenylamines
作者:Jonathan M. Shikora、Chanchamnan Um、Zainab M. Khoder、Sherry R. Chemler
DOI:10.1039/c9sc02835h
日期:——
Saturated heterocycles are important components of many bioactive compounds. The method disclosed herein enables a general route to a range of 5-, 6- and 7-membered oxygen and nitrogenheterocycles by coupling potassium alkyltrifluoroborates with heteroatom-tethered alkenes, predominantly styrenes, undercopper-catalyzedconditions, in the presence of MnO2. The method was applied to the synthesis of
Access to Aminated Saturated Oxygen Heterocycles via Copper-Catalyzed Aminooxygenation of Alkenes
作者:Jian Xie、Yue-Wei Wang、Lian-Wen Qi、Bo Zhang
DOI:10.1021/acs.orglett.7b00182
日期:2017.3.3
described. This novel methodology uses commercially available N-fluorobenzenesulfonimide as an amination reagent and provides a simple and efficient approach to a wide range of aminated saturated oxygenheterocycles in moderate to good yields. The reaction features mild reaction conditions, operational simplicity, and a broad substrate scope.
Enantioselective iodolactonization to prepare ε-lactone rings using hypervalent iodine
作者:Jenna L. Payne、Zihang Deng、Andrew L. Flach、Jeffrey N. Johnston
DOI:10.1039/d2sc01587k
日期:——
Despite the rapid growth of enantioselective halolactonization reactions in recent years, most are effective only when forming smaller (6,5,4-membered) rings. Seven-membered ε-lactones, are rarely formed with high selectivity, and never without conformational bias. We describe the first highly enantioselective 7-exo-trig iodolactonizations of conformationally unbiased ε-unsaturated carboxylic acids
Copper-Catalyzed Iminoiodane-Mediated Aminolactonization of Olefins: Application to the Synthesis of 5,5-Disubstituted Butyrolactones
作者:Delphine Karila、Loïc Leman、Robert H. Dodd
DOI:10.1021/ol202436a
日期:2011.11.4
A copper(I)-catalyzed reaction of a variety of 4-aryl-pent-4-enoates with nosyliminolodane generated in situ provides the corresponding 5-aryl-5. nosylamidomethylbutyrolactones. The reaction presumably proceeds via an aziridine intermediate, which could be isolated in one case.
BRADY W. T.; GIANG YUN-SENG F.; WENG L.; DAD MOHAMMAD M., J. ORG. CHEM., 52,(1987) N 11, 2216-2220
作者:BRADY W. T.、 GIANG YUN-SENG F.、 WENG L.、 DAD MOHAMMAD M.