The present invention relates to a process for the preparation of a compound of formula (I)
1
wherein Ts is a tosylate group and R is an alkyl group, an unsubstituted phenyl or substituted phenyl ring, or a benzyl or substituted benzyl group; which comprises:
(i) cyclising a compound of formula (II)
2
in the presence of a suitable catalyst; and
(ii) purifying and collecting the resultant compound of formula (I).
本发明涉及一种式(I)化合物的制备工艺
1
其中 Ts 为甲
苯磺酸盐基团,R 为烷基、未取代的苯基或取代的苯基环或苄基或取代的苄基;该工艺包括
(i) 环化式 (II) 的化合物
2
在合适的催化剂存在下环化式 (II) 2 的化合物;以及
(ii) 纯化和收集所得的式 (I) 化合物。