Synthesis of Cyclic Alkenyl Dimethylsiloxanes from Alkynyl Benzyldimethylsilanes and Application in Polyene Synthesis
作者:Haraldur G. Gudmundsson、Christian J. Kuper、Damien Cornut、Felix Urbitsch、Bryony L. Elbert、Edward A. Anderson
DOI:10.1021/acs.joc.9b01664
日期:2019.11.15
Cyclic dimethylalkenylsiloxanes, useful motifs for (Z)-selective Hiyama cross-coupling, are accessed from alkynyl benzyldimethylsilanes featuring adjacent allylic or homoallylic oxygen substituents by semihydrogenation/debenzylation/cyclization. While formation of 5- and 6-membered rings can be achieved from the free alcohols using fluoride or silanolate, allylic acetate precursors to 5-membered rings
环状二甲基链烯基硅氧烷是(Z)-选择性Hiyama交叉偶联的有用基序,可通过半氢化/脱苄基/环化作用从具有相邻烯丙基或均烯丙基氧取代基的炔基苄基二甲基硅烷中获得。尽管可以使用氟化物或硅烷醇化物从游离醇中形成5元和6元环,但5元环的烯丙基乙酸酯前体显示出不同的活化方式。通过制备多种含(Z)-烯烃的多烯并将其应用于简明的白三烯B3的合成中,证明了这些化合物的实用性。