Synthesis of nucleosides and related compounds. Part 21. Synthesis of 9-(t-2,c-3-dihydroxymethyl-r-1-cyclopropyl)-9H-adenine (a lower methylene homolog of carbocyclic oxetanocin) and related compounds.
A simple one-pot method for the mercuric oxide mediated synthesis of piperazines via oxidative diamination of olefins
作者:Harpreet Kour、Satya Paul、Parvinder Pal Singh、Monika Gupta、Rajive Gupta
DOI:10.1016/j.tetlet.2012.11.110
日期:2013.2
Mercuric oxide mediated one-pot synthesis of substituted piperazines via oxidative diamination of olefins with N-protected ethylene diamine has been reported. Among the various conditions tried, mercuric(II)oxide/tetrafluoroboric acid gave good to excellent yields of the desired products. A series of piperazines have been synthesized and characterized by NMR and mass spectroscopy methods.
Asymmetric Allylic Alkylation of Acyclic Allylic Ethers with Organolithium Reagents
作者:Manuel Pérez、Martín Fañanás-Mastral、Valentín Hornillos、Alena Rudolph、Pieter H. Bos、Syuzanna R. Harutyunyan、Ben L. Feringa
DOI:10.1002/chem.201202251
日期:2012.9.17
CuI/phosphoramidite‐catalyzed asymmetric allylic alkylation of allyl ethers with organolithiumreagents is reported (see scheme). The use of organolithiumreagents is essential for this catalytic CC bond formation due to their compatibility with different Lewis acids. The versatility of allylic ethers under the copper‐catalyzed reaction conditions with organolithiumreagents is demonstrated in the shortest
报道了用有机锂试剂对烯丙基醚进行的高效,区域和对映选择性的Cu I /亚磷酰胺催化的不对称烯丙基烷基化反应(参见方案)。由于与不同的路易斯酸具有相容性,因此使用有机锂试剂对于这种催化的CC键形成至关重要。(S)-戊二酸的最短合成证明了烯丙基醚在铜催化的条件下与有机锂试剂的多功能性。
One-step Oxidation of Olefins into α-Phenylseleno Carbonyl Compounds
作者:Makoto Shimizu、Isao Kuwajima
DOI:10.1246/bcsj.54.3100
日期:1981.10
olefins has been examined with the following three types of reagents; (i) (C6H5Se)2–Br2–(Bu3Sn)2O, (ii) (C6H5Se)2–t-BuOOH, and (iii) (C6H6Se)2–(C6H5SeO)2O, and the corresponding α-phenylseleno carbonylcompounds have been obtained directly from the olefins.
First Evidence for the Formation of a Geminal Dizinc Carbenoid: A Highly Stereoselective Synthesis of 1,2,3-Substituted Cyclopropanes
作者:André B. Charette、Alexandre Gagnon、Jean-François Fournier
DOI:10.1021/ja017230d
日期:2002.1.1
Significant amounts of novel gem-dizinc carbenoids (RZnCHIZnR) are formed when diethylzinc is mixed with iodoform in CH2Cl2 at 0 degrees C. This reagent was shown to be effective in the cyclopropanation of butenediol derivatives to generate a cyclopropylzinc intermediate that could be trapped with a variety of electrophiles. 1,2,3-Substitutedcyclopropane derivatives are formed with excellent diastereoselectivities
The present invention relates generally to catalysts and processes for the Z-selective formation of internal olefin(s) from terminal olefin(s) via homo-metathesis reactions.