| 摘要 |
<p>ARYLSULPHONYL AZETIDINE COMPOUNDS, THEIR PREPARATION AND THEIR USE AS INTERMEDIATES Azetidine compounds of the general formula I < IMG > (I) wherein Ar represents an aryl group and X represents a hydrogen atom, a carboxyl group or a hydroxymethyl group; their preparation from pentaerythritol via compounds of formula < IMG > (V), < IMG > (IV), and < IMG > (III), < IMG > (II), wherein Hal represents chlorine, bromine or iodine, Y represents oxygen or < IMG > and Z represents Hal or OH, together with their use as intermediates in the preparation of 3-carboxyazetidine; also the compounds of formula < IMG > (VI) wherein R1 and R2 both represent hydrogen, or together represent < IMG ></p> |
