(E)-ethyl 2-(4-methylstyryl)-1H-indole-1-carboxylate 、
5-isopropyl-2,5-dihydrofuran-3-carbaldehyde 在
scandium tris(trifluoromethanesulfonate) 作用下,
以
二氯甲烷 为溶剂,
反应 24.0h,
以32.3%的产率得到(±)-(3a,4-trans)-ethyl 3a-formyl-1-isopropyl-4-(p-tolyl)-3,3a,4,5-tetrahydro-1H-furo[3,4-c]carbazole-6(10cH)-carboxylate