Stereoselective Iterative Convergent Synthesis of <i>Z</i>-Oligodiacetylenes from Propargylic Dithioacetals
作者:Chih-Wei Chen、Kunzeng Fan、Chih-Hsien Chen、Shou-Ling Huang、Yi-Hung Liu、Tsong-Shin Lim、Guan-Wu Wang、Tien-Yau Luh
DOI:10.1021/acs.joc.5b01626
日期:2015.9.4
A series of Bu-t-substituted Z-oligodiacetylenes (Z-ODAs) are synthesized from the reactions of allenyl/propargylic zinc reagents, obtained from the corresponding propargylic dithiolanes and BuLi, with dithiolane-substituted propargylic aldehydes followed by stereospecific elimination of beta-thioalkoxy alcohols under Mitsunobu conditions. The stereochemical assignments are based on NOE experiments. The X-ray structure of the hexamer further supports the Z configuration for each of the double bonds in these ODAs. The photophysical properties of these Z-ODAs have been examined and are compared with known related E- and Z-ODAs with different substituents.