A stereoselective synthesis of γδ-unsaturated ketones possessing perfluoroalkyl groups by trifluoroborane etherate mediated 1,4-addition reaction of alkenyldiisopropoxyboranes to α,β-unsaturated ketones
作者:Ei-ichi Takada、Shoji Hara、Akira Suzuki
DOI:10.1016/s0040-4039(00)61600-3
日期:1993.10
A variety of γ,δ-unsaturated ketones (3,5, and 7) having perfluoroalkyl groups were prepared stereoselectively by the trifluoroborane etherate mediated 1,4-addition reaction of alkenyldiisopropoxyboranes (1) to α,β-unsaturatedketones substituted by perfluoroalkyl group (2,4, and 6). The undesired 1,2-addition of alkenyl groups or elimination of metal fluoride from the adducts could be avoided completely
The synthesis of conjugateddienones by means of palladium-catalyzed cross-coupling reaction between (E)-1-alkenyl-1,3,2-benzodioxaboroles or diisopropyl (Z)-1-hexenylboronate with 3-halo-2-alken-1-ones is described.
Palladium-catalyzed cross-coupling reaction of organoboron compounds with organic triflates
作者:Takayuki Ohe、Norio Miyaura、Akira Suzuki
DOI:10.1021/jo00060a041
日期:1993.4
The cross-coupling reaction of 9-alkyl-9-borabicyclo[3.3.1]nonane (9-R-9-BBN), 1-alkenyl-1,3,2-benzodioxaborole, or aryl boronic acid with 1-alkenyl or aryl triflates in the presence of K3PO4 (1.5 equiv) and a catalytic amount of Pd(PPh3)4 or Cl2Pd(dppf) resulted in high yields. The reaction conditions are sufficiently mild so that a variety of functionalized alkenes, alkadienes, and arenes are readily obtained. The utility of the present reaction was demonstrated by the cyclization of omega-alkenyl triflates leading to a benzo-fused cycloalkene and bicyclic alkene via a hydroboration-intramolecular coupling sequence.
Bf3 etherate mediated 1,4-addition of 1-alkenyldialkoxyboranes to α,β-unsaturated ketones. A stereoselective synthesis of γ, δ-Unsaturated ketones