A route to the polyacetylenic C18-acids containing 1-en-4-yne unsaturation
作者:A. G. Fallis、Ewart R. H. Jones、V. Thaller
DOI:10.1039/c29690000924
日期:——
A modified Witting procedure makes possible the synthesis of 1-en-4-yne systems; ethynyl group protection with the trimethylsilyl group facilitates iodoacetylene formation for subsequent coupling reactions.
(GRAPHICS)Transannular PtCL2-catalyzed cycloisomerizations open a new route to cyclopropanic tricyclic systems. Ketones A or C were efficiently prepared from the same cycloundec-5-en-1-yne precursor B, depending on the substituent at the propargylic position (either benzoate or methoxy).