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We reported herein an iridium/silver/acid ternary catalytic system to access bisbenzannulated [6,6]‐spiroketals in high efficiency with generally high diastereo‐ and enantioselectivities (up to >20 : 1 dr, >99 % ee). In this procedure, readily available o‐alkynylacetophenones undergo cycloisomerization to generate isochromenes in situ that participate in stereoselective allylation/spiroketalization...
We reported herein an iridium/silver/acid ternary catalytic system to access bisbenzannulated [6,6]‐spiroketals in high efficiency with generally high diastereo‐ and enantioselectivities (up to >20 : 1 dr, >99 % ee). In this procedure, readily available o‐alkynylacetophenones undergo cycloisomerization to generate isochromenes in situ that participate in stereoselective allylation/spiroketalization...