| 摘要 |
<p>The invention relates to a process for the preparation of the products (I): …<IMAGE>… R being hydrogen, alkyl, alkenyl, cyano, formyl, carboxy, alkoxycarbonyl, [(arylalkyl)oxy]carbonyl or halogen and R' a protective group, characterised in that a product (II): …<IMAGE>… is treated with a base and then with an alkyl borate to obtain the product (III): …<IMAGE>… whose free hydroxyl is protected and which is then hydrolysed. …<??>The products (I) are intermediates which are useful in organic synthesis.</p> |
