3,4-Dihydrocoumarin derivatives were synthesized in a highly enantioselective manner from 3-(2-hydroxyphenyl)cyclobutanones through enantioselective carbon−carbon bond cleavage. A cascade reaction with electron-deficient alkenes introduced a carbon−carbon bond at the 5-position of the dihydrocoumarins.
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Matsuda et al. (2007) studied this question.
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