Further improvements of the dibutyl tin oxide-catalyzed regioselective diol tosylation
摘要:
In this Letter, we report that selective monotosylation of a 1,2-diol is possible using only 0.1 mol % of Bu2SnO. More interestingly, we found that the corresponding tin acetal 3b gave faster conversions and more reproducible reaction times. Moreover, the loading of this catalyst could be as low as 0.05-0.005 mol %. (C) 2009 Elsevier Ltd. All rights reserved.
Macrocyclisation en series lactone, thiolactone et lactame à motif ethylenedioxy
作者:N. Leygue、C. Picard、P. Tisnes、L. Cazaux
DOI:10.1016/s0040-4020(01)81441-1
日期:1988.1
The orientation of the macrocyclizacion reaction leading to the di or tetrafunctional titled compounds has been studied for 12 and 24 membered rings containing ethylene dioxy moieties. The reactions were carried out from not activated diol, dithiol or diamine and from their silyl and stannyl derivatives. They were not performed at high dilution. The intracyclic oxygen atoms had a strong influence on
Palladium-catalysed substitution reactions of geminal allylic diacetates
作者:Fanie R. van Heerden、Johan J. Huyser、D. Bradley、G. Williams、Cedric W. Holzapfel
DOI:10.1016/s0040-4039(98)01000-4
日期:1998.7
The Pd(0)-catalysed substitution of allylic 1,1-diacetates by both carbon and oxygen nucleophiles is described. The products isolated resulted from either single or double substitution reactions.
Molecular receptors. Synthesis of macrocyclic polyethers with intra-annular functional groups using dibutylstannylene derivatives of vicinal diols
作者:M. Anthony McKervey、Thomas O'Connor
DOI:10.1039/c39820000655
日期:——
Symmetrical and unsymmetrical macrocyclicpolyethers containing the 1,3-xylyl sub-unit and intra-annular functionalgroups have been synthesied from 2,6-bis(bromomethyl)anisole and dibutylstannylene derivatives of ethylene glycol, a chiral glycol derived from (+)-tatraric acid, and trans-cyclohexane-1,2-diol.