An offer you can′t re‐fused: The first examples of a convenient domino synthesis of 7,11‐diphenyl‐9,10‐dihydro‐8H‐cyclopentaphenanthridine derivatives, such as 3, by the domino palladium‐catalyzed cyclization reactions of simple 1,6‐diynes with bromo(iso)quinoline in a single operation are described.
An extraordinary domino method for the construction of polycyclic aromatic hydrocarbons has been established. Various 4,9‐diphenyl‐2,3‐dihydro‐1H‐cyclopenta[b]naphthalene derivatives are constructed by the palladium(0)‐catalyzed reaction of diynes with aryl halides through C–C coupling and CH bond activation of the incorporated aryl group, which provides an effective π‐system synthesis.
已经建立了用于构造多环芳族烃的非同寻常的多米诺骨牌方法。各种4,9-二苯基-2,3-二氢- 1 ħ环戊二烯并[ b ]萘衍生物是由钯构成(0)至C-C偶联和C与芳基卤化物的二炔催化的反应 H键活化的结合的芳基,可提供有效的π系统合成。
Enantioselective, Desymmetrizing Bromolactonization of Alkynes
作者:Michael Wilking、Christian Mück-Lichtenfeld、Constantin G. Daniliuc、Ulrich Hennecke
DOI:10.1021/ja402910d
日期:2013.6.5
Asymmetric bromolactonizations of alkynes are possible using a desymmetrization approach. The commercially available catalyst (DHQD)(2)PHAL promotes these cyclizations in combination with cheap NBS as a bromine source to give bromoenol lactones in high yield and with high enantioselectivity. The bromoenol lactone products, containing a tetrasubstituted alkene and a quaternary stereocenter are valuable building blocks for synthetic chemistry.