InCl3 immobilized in ionic liquids: a novel and recyclable catalytic system for tetrahydropyranylation and furanylation of alcohols
作者:Jhillu Singh Yadav、Basi. V. Subba Reddy、Dughani Gnaneshwar
DOI:10.1039/b210044b
日期:2003.1.20
A mild and highly efficient method has been developed for the protection of hydroxyl compounds as tetrahydropyranyl and furanyl ethers using a catalytic amount of indium trichloride immobilized in 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid under mild conditions. A wide range of functional and protecting groups such as THP, TBDMS, TBDPS, PMB, MOM ethers, acetonides, olefins and epoxides are compatible with ionic liquids. Monoprotection of diols has also been achieved using this novel procedure.
Indium Tribromide: A Novel and Highly Efficient Reagent for the Conversion of Oxiranes to Thiiranes
作者:J. S. Yadav、B. V. Reddy、Gakul Baishya
DOI:10.1055/s-2003-37103
日期:——
Epoxides react smoothly with potassium thiocyanate in the presence of 5 mol% of indium tribromide under mild and convenient reaction conditions to afford the corresponding thiiranes in high yields. This method is compatible with a wide range of protecting groups and functional groups such as alkenes, alkynes, esters, THP, TBDMS, and PMB ethers present in the molecule.
Octahydroisoquinoline compounds as opioid receptor modulators
申请人:Carroll Ivy Frank
公开号:US20070027182A1
公开(公告)日:2007-02-01
Compounds which bind to opioid receptors are provided. In a preferred embodiment of the invention, the compounds are opioid receptor antagonists. The present invention also provides methods of treating conditions which are mediated by an opioid receptor.
Intramolecular Reactions of Hydroperoxides and Oxetanes: Stereoselective Synthesis of 1,2-Dioxolanes and 1,2-Dioxanes
作者:Peng Dai、Patrick H. Dussault
DOI:10.1021/ol051407h
日期:2005.9.1
[reactions: see text] The 5-exo openings of oxetanes by hydroperoxides proceed rapidly and stereospecifically to furnish 1,2-dioxolanes. The corresponding 6-exo cyclizations are slower and proceed with moderate stereoselectivity. In the case of hydroperoxy acetals, 5-exo nucleophilic transfer of alkoxide competes effectively with 6-exo attack by the hydroperoxide.
A new synthesis of 1,7-dioxaspiro[5.5]undecanes. Application to a rectal gland secretion of the olive fruit fly ( ).
作者:Philip Kocienski、Clive Yeates
DOI:10.1016/s0040-4039(00)94309-0
日期:1983.1
The oxirane ring of the tetrahydropyranyl ether of 3,4-epoxybutan-1-ol underwent nucleophilic scission by the organocuprate derived from 6-lithio-3,4-dihydro-2(H)-pyran to give an intermediate which was converted to 4-hydroxy-1,7-dioxaspiro[5.5]undecane on acid hydrolysis.