Direct Halogenation of Alcohols and Their Derivatives withtert-Butyl Halides in the Ionic Liquid [pmIm]Br under Sonication Conditions - A Novel, Efficient and Green Methodology
作者:Brindaban C. Ranu、Ranjan Jana
DOI:10.1002/ejoc.200400597
日期:2005.2
A novel halogenating reagentsystem for direct halogenation of alcohols has been developed. tert-Butyl bromide, chloride and iodide in combination with the ionic liquid [pmIm]Br have been found to convert alcohols into the corresponding bromides, chlorides and iodides under sonication conditions (or heating) in good yields. Although a variety of primary and secondary alcohols participated in this reaction
Ionic Liquid as Catalyst and Reaction Medium: A Simple, Convenient and Green Procedure for the Synthesis of Thioethers, Thioesters and Dithianes using an Inexpensive Ionic Liquid, [pmIm]Br
作者:Brindaban C. Ranu、Ranjan Jana
DOI:10.1002/adsc.200505122
日期:2005.11
room temperature ionicliquid, 1-pentyl-3-methylimidazolium bromide, [pmIm]Br efficiently catalyzes the reaction of alkyl halides or acyl halides with thiols without any solvent at room temperature leading to the synthesis of thioethers and thioesters in high yields. This reaction has also been extended for the preparation of dithianes and transthioetherification. The ionicliquid is recovered and
Tetrahydrobenzochromene Synthesis Enabled by a Deconjugative Alkylation/Tsuji–Saegusa–Ito Oxidation on Knoevenagel Adducts
作者:Primali V. Navaratne、Alexander J. Grenning
DOI:10.1021/acs.orglett.8b01857
日期:2018.8.3
A modular and practical route to versatile cyano-1,3-dienes by a sequence involving deconjugative alkylation and “Tsuji–Saegusa–Ito oxidation” is reported. In this letter, the versatility of the products is also explored, including a route to benzochromene scaffolds common to many natural products.
The synthesis of benzannulated spiroketals from 1,1-diacyl-2-phenylcyclopropanes
作者:Sinan Gai、Jackson S. Henneveld、Andrew P. Cording、Michael P. Badart、Nigel T. Lucas、Bill C. Hawkins
DOI:10.1016/j.tetlet.2021.152984
日期:2021.4
A new method to access benzannulated spiroketals from 1,1-diacyl phenylcyclopropanes is described. The method provides rapid access to 5,5 and 5,6-benzannulated spiroketals in low to moderate yields and with moderate to good diastereoselectivity.
HIV protease inhibitors having polyether substituents
申请人:MERCK & CO. INC.
公开号:EP0487270A2
公开(公告)日:1992-05-27
Polyether derivatives of the form,
A-G-B-B-J
wherein G is a dipeptide isostere substituted with a polyether, B an amino acid or analog thereof, and J a small terminal group are described. These compounds are useful in the inhibition of DIV protease, the prevention or treatment of infection by HIV and the treatment of AIDS, either as compounds, pharmaceutically acceptable salts, pharmaceutical composition ingredients, whether or not in combination with other antivirals, immunomodulators, antibiotics or vaccines. Methods of treating AIDS and methods of preventing or treating infection by HIV are also described.