9,10-Dihydro-4H-benzo[4,5]cyclohepta[1,2-b]thiophen-4-one → 4-(3,5-Dimethyl-benzylidene)-9,10-dihydro-4H-1-thia-benzo[f]azulene

Participants

Reaction Steps

Following the procedures essentially as described in Example 238 and using 9,10-dihydro-1-thia-benzo[f]azulene-4-one (47.0 mg (0.22 mmol) and solution of 3,5-dimethylbenzyl magnesium bromide(0.650 mmol) in THF, provides, after dehydration, 39.6 mg (57%) of the title compound as a 1.6:1 mixture of E- and Z-isomers. MS (EI): 316 (M+); 1H NMR (CDCl3) δ 2.13 (s, 18/5 H), 2.24 (s, 12/5 H), 2.40-3.80 (m, 4 H), 6.54 (d, J=5.6 Hz, 2/5 H), 6.53-6.55 (m, 7/5 H), 6.74 (s, 3/5 H), 6.83-6.84 (m, 2/5 H), 6.86 (s, 3/5 H), 6.93 (s, 3/5 H), 7.01-7.02 (m, 1 H), 7.08 (app d, J=5.6 Hz, 2/5 H), 7.14 (app d, J=5.6 Hz, 2/5 H), 7.19-7.25 (m, 4 H), 7.30 (d, J=8.0 Hz, 3/5 H), 7.37-7.39 (m, 2/5 H).

Provenance & Evidence