| http://www.w3.org/ns/prov#value | - Additionally, since the naphthofuran backbone is a part of some natural compounds such as maturin, maturin acetate and 14-methoxydehydrocacalohastine, and novel strategies for the synthesis of naphthofuran backbone continue to receive considerable attention in the field of synthetic organic chemistry,45-47 we also attempted the reaction of 1 with 2-hydroxy-1-naphthaldehyde (2j) (Scheme 3) under si
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