Stereo selective synthesis of rigid 9,10-didehydro retinoic acids was achieved from (2Z or 2E,4E)-5-iododienoic acids through a Heck-Sonogashira cross-coupling reaction. (C) 2002 Elsevier Science Ltd. All rights reserved.
Stereoselective Synthesis of Trienoic Acids: Synthesis of Retinoic Acids and Analogues
Stereoselective construction of conjugated trienoic acids was achieved through two successive Stille reactions, the first step consisting of the coupling of (E)-1,2-bis(tributylstannyl)ethene and tributylstannyl (Z)- or (E)-3-iodoalk-2-enoates. Two different routes were used for the second step: (1) cross-coupling of the stannyldienoic acid reagents and vinyl iodides, or (2) cross-coupling of vinylstannane