Convenient in situ generation of various dichlorinating agents from oxone and chloride: diastereoselective dichlorination of allylic and homoallylic alcohol derivatives
作者:Jingyun Ren、Rongbiao Tong
DOI:10.1039/c3ob40670a
日期:——
A safe and convenient protocol was developed for in situ generation of various dichlorinating agents (cf. Cl2, NCl3, Et4NCl3, ArICl2) from oxone and chloride. The synthetic utility of this protocol was demonstrated by diastereoselective dichlorination of a series of allylic and homoallylicalcohol derivatives with excellent yields and diastereoselectivity.
Benzylation of Alcoholic Hydroxyl Groups with Benzyl Mesylate by Using a Catalytic Amount of Lithium Tetrakis(pentafluorophenyl)borate in the Coexistence of Lithium Triflate and Magnesium Oxide
Several alcohols possessing alkali-labile substituents such as halogen, ester and ketone were effectively benzylated with benzyl mesylate by using a catalytic amount of lithium tetrakis(pentafluorophenyl)borate [LiB(C6F5)4] in the coexistence of lithium triflate (LiOTf) and magnesium oxide (MgO) to afford the corresponding benzyl ethers in good to excellent yields.
Synthesis of a Bench-Stable Manganese(III) Chloride Compound: Coordination Chemistry and Alkene Dichlorination
作者:Ananya Saju、Justin R. Griffiths、Samantha N. MacMillan、David C. Lacy
DOI:10.1021/jacs.2c08509
日期:2022.9.21
by treating acetonitrile solvated MnCl3 (2) with Ph3PO and collecting the resulting blue precipitate. 1 is useful in coordination reactions by virtue of the labile Ph3PO ligands, and this is demonstrated through the synthesis of Tpm*}MnCl3 (3). In addition, methodologies in synthesis that rely on difficult or cumbersome to prepare solutions of reactive MnCl3 can be accomplished using 1 instead. This
Di-functionalization of Alkenes Using an Oxidant Generated from Manganese(II) Chloride under Oxygen: Synthesis ofg-Lactones
作者:Akira Hosomi、Makoto Hojo、Chikara Murakami、Kaori Ohno、Jun Kuboyama、Shin-ya Nakamura、Hajime Ito
DOI:10.3987/com-97-s(n)30
日期:——
Synthesis of Vicinal Dichlorides via Activation of Aliphatic Terminal Epoxides with Triphosgene and Pyridine
作者:Alexander H. Cleveland、Frank R. Fronczek、Rendy Kartika
DOI:10.1021/acs.joc.7b03197
日期:2018.3.16
Herein we report a novel synthetic reaction to convert unactivated terminal aliphatic epoxide to alkyl vicinal dichloride based on triphosgene–pyridine activation. Our methodology is operationally simple and readily tolerated by a broad of scope of substrates as well as protecting groups. Furthermore, these mild conditions generally yield clean reaction mixtures that are free of byproducts upon aqueous