Benzocyclobutadienes via Electrocyclizations of (<i>Z,Z</i>)-3,5-Octadiene-1,7-diynes Leading to Dimers with Unusual Polycyclic Structures
作者:Kung K. Wang、Bin Liu、Jeffrey L. Petersen
DOI:10.1021/ja960506a
日期:1996.1.1
Z)-3,5-Octadiene-1,7-diynes 15a−e were synthesized by condensation of enynyl aldehydes 12a−e with allenylborane 11 to furnish enynyl alcohols 14a−e followed by the elimination step of the Peterson olefination reaction. Desilylation of 15a with tetrabutylammoniumfluoride (TBAF) followed by two consecutive electrocyclizations resulted in the formation of the corresponding benzocyclobutadiene 17a, leading