reaction with the hydrated p-TsOH afforded trans-isomers of dihydrospiro[indoline-3,6′-naphtho[2,3-c]carbazoles] as major products. Alternatively, the reaction with anhydrous p-TsOH under a Dean and Stark apparatus predominately gave cis-isomer of dihydrospiro[indoline-3,6′-naphtho[2,3-c]carbazoles]. On the other hand, the similar p-TsOH catalyzed reaction of 2-(indol-3-yl)naphthalene-1,4-diones with
p -TsOH 催化的 2-(1-烷基
吲哚-3-基)
萘-1,4-二酮和 3-phenacylideneoxindoles 的 Diels-Alder 反应显示出迷人的非对映选择性。与
水合p- TsOH反应得到二氢螺[indoline-3,6'-
萘并[2,3- c ]
咔唑]的反式异构体作为主要产物。或者,在迪安-斯达克装置下与无
水p- TsOH反应主要得到二氢螺[二氢
吲哚-3,6'-
萘并[2,3- c ]
咔唑]的顺式异构体。另一方面,类似的p- TsOH 催化 2-(indol-3-yl)naphthalene-1,4-diones 与 3-arylideneindolin-2-ones 的反应得到顺式/反式-二氢螺[indoline-3,6'-naphtho[2,3- c ]
咔唑]的异构体。此外,p- TsOH 催化 2-(indol-3-yl)naphthalene-1,4-diones