The synthesis of common cyclopropenes has been widely studied, but the synthesis of
cyclopropenols is a significant challenge. Here, we highlight our recent work on the
synthesis of trifluoromethylated cyclopropenols through a [2+1] cycloaddition reaction
between alkynes and (trifluoroacetyl)silanes under visible-light-induced organocatalysis.
The novel amphiphilic donor–acceptor carbenes derived from (trifluoroacetyl)silanes
can react effectively with both activated and nonactivated alkynes. A broad substrate
scope and a good functional-group tolerance have been achieved. Moreover, the synthetic
potential of this reaction was highlighted by a gram-scale reaction and the one-pot
diastereoselective synthesis of trifluoromethylated cyclopropanols.
Key words
cyclopropenols - photocatalysis - organocatalysis - cyclopropanols - carbenes