Palladium(0)-catalyzed thioboration of terminal alkynes with 9-(alkylthio)-9-borabicyclo[3.3.1]nonane derivatives: stereoselective synthesis of vinyl sulfides via the thioboration-cross-coupling sequence
作者:Tatsuo Ishiyama、Kohichi Nishijima、Norio Miyaura、Akira Suzuki
DOI:10.1021/ja00069a020
日期:1993.8
The addition of 9-(alkylthio)-9-borabicyclo[3.3.1]nonanes (9-(RS)-9-BBN) 1 to terminal alkynes was catalyzed by Pd(PPh 3 ) 4 3 mol %) to produce 9-[(Z)-2-(alkylthio)-1-alkenyl]-9-BBN derivatives 2 in high yields. The reactions were highly regio- and stereoselective, and their conditions were sufficiently mild that a variety of functionalized alkenylboranes 2 with defined stereochemistry were readily
9-(烷硫基)-9-硼双环[3.3.1]壬烷(9-(RS)-9-BBN) 1 加成到末端炔烃由Pd(PPh 3 ) 4 3 mol %)催化产生9- [(Z)-2-(烷硫基)-1-烯基]-9-BBN 衍生物 2 的收率很高。这些反应具有高度的区域选择性和立体选择性,并且它们的条件足够温和,可以很容易地合成各种具有确定立体化学的官能化烯基硼烷 2。硼烷 2 在与甲醇进行质子分解以产生硫醇与 1-炔烃、2-(烷硫基)-1-烯烃 3 的马尔科夫尼科夫加合物时表现出异常高的反应性。本反应的合成效用由区域选择性和立体选择性反应证明-通过钯催化的硫代硼化-交叉偶联序列合成烯基硫化物 7