One-Pot Synthesis of Novel Dibenzoxanthenes, Diarylbutanes, and Calix[4]resorcinarenes via Consecutive Pyrrolidine Ring-Closure/Ring-Opening Reactions

Table 1

Synthesis of the compounds 5–10.

No.	Compound	Yield (%)^a,b
1	5a	87 (78)
2	5с	79 (53)
3	6b	65 (57)
4	7a	72 (28)
5	8a	95 (74)
6	8b	93 (69)
7	8c	59 (48)
8	9a	42 (60)
9	10a	70 (74)
10	10d	62 (56)

^aIsolated yield; ^byield from 2-(2-hydroxynaphthalene-1-yl)pyrrolidine according to the procedure described in [27] is given in parentheses.