Hetero-Diels–Alder reaction of photochemically generated α-hydroxy-o-quinodimethanes with trifluoromethyl ketones
作者:Ken Takaki、Toshifumi Fujii、Hosei Yonemitsu、Makoto Fujiwara、Kimihiro Komeyama、Hiroto Yoshida
DOI:10.1016/j.tetlet.2012.05.082
日期:2012.8
Hetero-Diels–Alder reaction of α-hydroxy-o-quinodimethanes photochemically generated from o-tolualdehydes with trifluoromethyl ketones gave a mixture of hemiacetals and hydroxyaldehydes in fairly good yields. Their subsequent oxidation with PCC provided 1-isochromanones as formal oxidative [4+2] cycloaddition products. In contrast, similar reaction of aromatic ketones such as o-methylbenzophenone,