Table 2. Synthesis of Spiroindoloquinazoline Compounds.

entry	tryptanthrin 1	active methylene compound 2	nucleophile 3	time (min)	product/[yield %]	observed m. pt.	reported m. pt. (references)
1	1a	2a	3a	60	4a [85]	296–298	>27020
2	1a	2a	3b	60	4b [86]	266–268	>27020
3	1a	2a	3d	60	4c [86]	296–298	this work
4	1a	2a	3e	90	4d [88]	305–310	this work
5	1a	2b	3a	90	4e [82]	262–265	this work
6	1a	2b	3b	90	4f [84]	212–214	this work
7	1a	2b	3c	90	4g [88]	258–260	this work
8	1a	2b	3d	60	4h [82]	226–230	this work
9	1b	2a	3a	90	4i [86]	305–310	>27020
10	1b	2a	3b	90	4j [85]	264–268	>27020
11	1b	2a	3c	90	4k [81]	242–246	>27020
12	1b	2a	3d	90	4l [86]	212–214	this work
13	1c	2a	3a	120	4m [87]	278–280	this work
14	1c	2a	3b	90	4n [88]	254–256	this work
15	1c	2a	3d	120	4o [85]	212–214	this work