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Figure 21. Various derivatizations of cyclopropane-fused chromane 70 and the cyclopropanation product 69. This figure is used with
permission from the American Chemical Society [80] .
Figure 22. Dearomatization of in situ generated benzopyrylium triflates with sulfoxonium ylides. This figure is used with permission
from the Royal Society of Chemistry [81] .
also conceived that the possibility of controlling the enantioselectivity of the cyclopropanation would be
offered by a suitable chiral anion-binding catalyst through the non-covalent interaction with benzopyrylium
triflates 88 for the formation of intermediate 89. Therefore, with a cinchonidine-derived thiourea C20 as the
