Table 2 Synthesis of spiro[imidazo[1,2-a]indeno[2,1-e]pyridine-5,1'-indene (5a–d).

From: Synthesis of diverse spiro-imidazo pyridine-indene derivatives via acid-promoted annulation reaction of bindone and heterocyclic ketene aminals

Entry

Diamine

Product

Time (h)

Yield (%)

1

1

76

2

2

72

3

6

85

4

7

61

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