Palladium(0)-Catalyzed Asymmetric Synthesis of 1,2,3,4-Tetrahydro-2-vinylquinoxalines
作者:Magali Massacret、Paul Lhoste、Denis Sinou
DOI:10.1002/(sici)1099-0690(199901)1999:1<129::aid-ejoc129>3.0.co;2-6
日期:1999.1
N-bis(arylsulfonyl)-o-phenylenediamines 1 was catalyzed by a palladium complex associated with chiral ligands to give optically active 1,4-bis(arylsulfonyl)-1,2,3,4-tetrahydro-2-vinylquinoxalines 3 with up to 62% ee. The use of (S)-MeOBIPHEP as the chiral ligand and N,N-bis(p-tolylsulfonyl)-o-phenylenediamine (1i) as the nucleophile led to the highest ee at 25 °C, regardless of the solvent used. The enantioselectivity
(Z)-1,2-双(甲氧基羰基氧基)丁-2-烯(2)与各种N,N-双(芳基磺酰基)-邻苯二胺1的反应由与手性配体缔合的钯配合物催化,得到光学活性 1,4-双(芳基磺酰基)-1,2,3,4-四氢-2-乙烯基喹喔啉 3 具有高达 62% ee。使用 (S)-MeOBIPHEP 作为手性配体,使用 N,N-双(对甲苯磺酰基)-邻苯二胺 (1i) 作为亲核试剂,无论使用何种溶剂,在 25 °C 时都具有最高的 ee。环化的对映选择性受氮原子上的取代基性质的强烈影响。