Key points are not available for this paper at this time.
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.
Matsuda et al. (Tue,) studied this question.