@article{oai:kitami-it.repo.nii.ac.jp:00008448,
 author = {Hoshi, Masayuki and Iizawa, Tomohiko and Okimoto, Mitsuhiro and Shirakawa, Kazuya},
 journal = {Synthesis},
 month = {},
 note = {Described herein is an operationally simple and mild method for the stereospecific synthesis of internal conjugated (Z)-enynyltrimethylsilanes whose conjugation is extended away from the distal alkynyl carbon atom. This protocol involves two types of cross-coupling reaction, a Suzuki-type reaction and a sila-Sonogashira reaction, and the desired synthesis can be performed in a one-pot manner. Thus, the copper-mediated cross-coupling reaction of dicyclohexyl[(Z)-1-(trimethylsilyl)alk-1-enyl]boranes with (trimethylsilyl)ethynyl bromide is carried out in the presence of aqueous lithium hydroxide at -15 ?C to room temperature, resulting in the stereospecific formation of (Z)-1,3-bis(trimethylsilyl)alk-3-en-1-ynes. Subsequent reaction is allowed to proceed without isolation of the enynes. Thus, palladium/copper-catalyzed cross-coupling reactions with aryl iodides, cycloalk-1-enyl triflates, and (E)- and (Z)-alk-1-enyl iodides can be accomplished in the presence of either 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) or tetrabutylammonium fluoride (TBAF) at ambient temperature to provide the corresponding internal conjugated (Z)-enynyltrimethylsilanes possessing one more sp-sp2 carbon bond.},
 pages = {3591--3600},
 title = {One-pot synthesis of internal conjugated (Z)-enynyltrimethylsilanes possessing aryl, cycloalkenyl, (E)- or (Z)-alk-1-enyl moieties on the sp carbon atom via two types of cross-coupling reaction},
 volume = {22},
 year = {2008}
}