1,4-Carbonyl participation in solvolysis of alkyl toluene-p-sulphonates
作者:Philip K. G. Hodgson、Stuart Warren
DOI:10.1039/p29750000372
日期:——
2,2-Dimethyl-3-oxo-3-phenylpropyl toluene-p-sulphonate (tosylate) and some related 3-oxoalkyl tosylates are solvolysed in buffered carboxylic acid solvents by 1,4-carbonyl participation to give unrearranged carboxylate esters. The reactions are too fast to be direct displacements, and do not occur in similar compounds which lack the carbonyl group. Secondary alkyl tosylates in the same series also
3-Aryloxazolidinone derivatives, process for their preparation and their
申请人:Delalande S.A.
公开号:US05036090A1
公开(公告)日:1991-07-30
The derivatives of the formula: ##STR1## wherein: R.sub.1 is H or C.sub.1 -C.sub.4 alkyl; X is an oxygen atom, a methylene group or a --CH.dbd.CH-- group; n is 1 or 2 when X is an oxygen atom or a methylene group and is 0 or 1 when X is a --CH.dbd.CH-- group; R.sub.3 is a C.sub.1 -C.sub.4 alkyl, C.sub.3 -C.sub.7 cycloalkyl, phenyl, benzyl, CHF.sub.2, CF.sub.3 or CF.sub.3 CF.sub.2 group; each of R.sub.2 and R'.sub.2 independently is a hydrogen atom or a C.sub.1 -C.sub.4 alkyl, C.sub.4 -C.sub.7 cycloalkyl, phenyl or benzyl group; R'.sub.2 and R.sub.3 may further form together a --(CH.sub.2).sub.3 -- or --(CH.sub.2).sub.4 -- chain; and each of R.sub.4 and R'.sub.4 independently is a C.sub.1 -C.sub.4 alkyl group or R.sub.4 and R'.sub.4 form together either a --(CH.sub.2).sub.2 -- or --(CH.sub.2).sub.3 -- chain, a --(CH.sub.2).sub.2 -- or --(CH.sub.2).sub.3 -- chain substituted by one or two C.sub.1 -C.sub.4 alkyl groups, or a --(CH.sub.2).sub.2 -- chain substituted by one or two --CH.sub.2 --NH.sub.2 groups or by one or two --CH.sub.2 --NH.sub.2 groups N-substituted by one or two C.sub.1 -C.sub.4 alkyl groups, useful as drugs.