Abstract:
Process for the preparation of 2-methoxyimino-2-arylacetic esters of formula (I) in which R is C.sub.1 -C.sub.12 alkyl, which comprises reacting an appropriately substituted boronic acid of general formula (II) or the trimeric form (lII) herein, which is in equilibrium with it, in the presence of a Pd catalyst, with a methoxyiminoacetic ester of formula (IV) in which R is C.sub.1 -C.sub.12 alkyl and X is a leaving group. According to a further process variant, in principle the groups which split off the two reactants may change places. The process can be applied not only to phenyl derivatives but also to larger ring systems (naphthyl, pyridyl, heterocycles).
Abstract:
A process for the preparation of 3-hydroxyoxetanes of formula I ##STR1## wherein R.sub.9 and R.sub.10 are each independently of the other hydrogen or C.sub.1 -C.sub.4 alkyl, by(1) reaction of a carboxylic acid R--CO.sub.2 H, wherein R is branched alkyl, with an epichlorohydrin of formula II ##STR2## wherein R.sub.9 and R.sub.10 are as defined hereinbefore, to form an ester of formula III ##STR3## wherein R, R.sub.9 and R.sub.10 are as defined hereinbefore, (2) reaction of that ester with an ether of formula IVCHR.sub.1 .dbd.CH--O--R.sub.2 (IV),wherein R.sub.1 is hydrogen or methyl, R.sub.2 is C.sub.1 -C.sub.6 alkyl, or R.sub.1 and R.sub.2 together form a radical of formula --(CH.sub.2).sub.3 --, in the presence of a catalyst, to form an ester of formula V ##STR4## (3) hydrolysis and cyclization of that ester in the presence of a base to form a compound of formula VI ##STR5## wherein R.sub.1, R.sub.2, R.sub.9 and R.sub.10 are as defined hereinbefore,(4) acetal cleavage in the presence of an acid to form the corresponding 3-hydroxyoxetane and(5) isolation of that 3-hydroxyoxetane.
Abstract:
2-(2-haloethylthio)-phenylsulfonamides of formula I ##STR1## wherein R.sub.1 is hydrogen, C.sub.1 -C.sub.5 alkyl or C.sub.2 -C.sub.5 alkenyl and Z is hydrogen, fluorine or chlorine, are prepared by converting a phenylsulfonamide of formula II ##STR2## wherein Y is a tertiary alkyl group or a silyl group in succession and without isolating intermediates, witha) a strong base MeA, wherein Me is sodium or potassium, A is hydrogen, OH, NH.sub.2 or OR.sub.5 and R.sub.5 is C.sub.1 -C.sub.5 alkyl, into the compound of formula III ##STR3## converting that compound with b) one equivalent of n-butyllithium andc) sulfurinto the compound of formula IV ##STR4## reacting that compound with d) a 2-halofluoroethane of the formula X--CH.sub.2 CHF--Z wherein X is chlorine or bromine, to form a phenylsulfonamide of formula VI ##STR5## and then removing the group Y.