Stereoselective synthesis of exocyclic alkenes via hydroboration-cross-coupling sequence
作者:Norio Miyaura、Masako Ishikawa、Akira Suzuki
DOI:10.1016/s0040-4039(00)92245-7
日期:1992.4
The hydroboration of haloalkadienes (1) with 9-borabicyclo[3.3.1]nonane (9-BBN), followed by the intramolecular cross-coupling in the presence of palladium-catalyst and base gives a convenient short-step procedure for the synthesis of stereodefined exocyclic alkenes (3).
Palladium(0)-catalyzed intramolecular cross coupling of bromodialkenylamines, bromoalkenylalkenamides and bromodialkenyl ethers followed by in situ [4+2] cycloaddition with suitable dienophiles gave tetrahydroisoindolines (31−73% yield), tetrahydroisoindolin-1-ones (43−51%) and hexahydrobenzo[c]furans (35−55%), and hexahydro-1H-[2]pyrindines (66−75%), respectively, each in one-pot operations.