“…However, there is only one example reported for the benzene annulated oxygen heterocycles, 3-(2,2,2trifluoroacetyl)chroman-4-one 41, and with substrate/catalyst molar ratio (S/C) of 100 was realized (Scheme 14(b)). [57] Fang and co-authors have applied the TsDPEN complex TMC13 in ATH to give the cis-2,3-dihydrobenzofuran-3-ols 43, [58] the compounds with multiple stereocenters also could be obtained, such as 44 [59,60] and 45 [61] (Scheme 14(c)).…”