Indeno 6,12-diaryl derivatives

Figure 2.11 6,12-Diaryl derivatives of indeno[1,2-6]fluorene by the groups of Haiey(28k-q) and Yamashita (28k, 28r-t).

Synthesis of carbazoles and related indoles fused to carbocyclic rings is yet another fruitful field for application of the Fischer indolization, which has for example resulted in routes to indeno[2,l- ]indoles <20040M344>, diaryl-carbazoles <1999HC451>, tetrahydrocarbazole derivatives <2000JOC3387, 2003BMC3413, 1999CAL93,... 

Hetero-/-fused derivatives of indeno[/i]benzopyrans result from the chromenylation of fluoreno[3,4-()][l]benzofuranols and related S andNMe analogues. The furo- 25 and thieno-26 [2,3-7]benzopyrans show absorption bands between 450 - 530 nm and 550 - 640 nm according to the substituents on the gem diaryl function and generally appear as various shades of brown. The half-lives vary between 1 and 6 minutes, with the thiophene analogues exhibiting faster fade rates than the furan derivatives. The closed form of the sole pyrano-... 

Liping et al. [68] reported the iodine-catalyzed one-pot multicomponent reaction of ethyl trifluoroacetoacetate, indan-l,3-dione, ammonium acetate, and aromatic aldehyde which gave ethyl-6 -hydroxy-l,3-dioxo-2, 4 -diaryl-6 -(trifluoromethyl)-l,3-dihydrospiro[indene-2,3 -piperidine]-5 -carboxylate derivatives 50 as the major product and 2-trifluoromethyl-2,3,4,5-tetrahydro-l/f-indeno[l,2-b]pyridine derivative 51 as the minor product (Scheme 10.33). 

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