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A-Chloroglycidic esters

The carbanion derived from isopropyl dichloroacetate adds on to 5a-cholestan-3-one to give the 3/3-hydroxy-3 -carboxydichloromethyl derivative (148) under kinetic control, or the a-chloroglycidic ester (149) under thermodynamic control.151 The latter compound rearranges in refluxing dioxan to give the 3/3-chloro-3a-oxalyl derivative (150). [Pg.247]

Chlorodecarbomethoxylation, 480 Chlorodicarbonylrhodium(l) dimer, 108 Chlorodiphenylmethylium hexachloro-antimonate, 108-109 a-Chloroepoxy ketones, 354-355 Chlorofluorocyclopropanes, 511 Chlorofluorocarbene, 175, 511 /3-Chloroethyl isocyanate, 570 Chloroformates, 226 a-Chloroglycidic esters, 353 6-Chloro-N-hydroxybenzotriazole, 106... [Pg.370]

The acetonide-protected 4,5-dihydroxy-2-chloroglycidic ester 18 reacts with Mg halides to give 4-halo-3-hydroxypyran-2-ones in good yields together with small amounts of a rearrangement product. It is proposed that loss of acetone from the enohc form of this ester is followed by attack of the released hydroxy function at the ester carbonyl group. Protected... [Pg.384]

See other pages where A-Chloroglycidic esters is mentioned: [Pg.440]    [Pg.401]    [Pg.353]    [Pg.564]    [Pg.59]    [Pg.440]    [Pg.401]    [Pg.353]    [Pg.564]    [Pg.59]    [Pg.27]    [Pg.189]   
See also in sourсe #XX -- [ Pg.440 , Pg.441 ]



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