Abstract:The transannular Diels-Alder strategy has been applied to three 13-membered macrocyclic trienes whose characteristics are: a cis-trans diene and a cis methoxymethyl en01 ether as the dienophile. The successful trials led to three 6.6.5 tricyles having a trans-syn-cis geometry exactly as in the B.C.D. rings of the 14P-hydroxysteroids.Key words: transannular, Diels-Alder, 14P-hydroxysteroids, 13-membered rings.Resum6 : La stratkgie de Diels-Alder transannulaire a CtC appliquke sur trois triknes macrocycliques B 15 membres dont les caractkristiques sont : un dikne cis-trans et un Cther d'Cnol rnCthoxymCthyle cis comme diknophile. Les essais positifs ont conduit ii trois tricycles 6.6.5 ayant une gComCtrie traizs-syn-cis exactement comme les cycles B.C.D. des 14P-hydroxystCro'ides.