The present invention provides a process for preparing 5,6,7-trinor-4,8-inter-m-phenylene PGI.sub.2 derivative [VII] using 3a,8b-cis-dihydro-3H-5,7-dibromocyclopenta[b]benzofuran (1) as a starting material, as well as compounds of the formulae (8) and (11) which are intermediates for the preparation of the compound of the formula (1). ##STR1##
本发明提供了一种使用3a,8b-顺式-二氢-3H-5,7-双
溴基环戊[b]
苯并呋喃(1)作为起始物质制备5,6,7-三去氧-4,8-中间-m-苯撑
PGI.sub.2衍
生物[VII]的方法,以及用于制备式(1)化合物的式(8)和式(11)的中间体。 ##STR1##