Templated Assembly of Chiral Medium-Sized Cyclic Ethers via 8-endo-trig Nucleophilic Cyclization of Cyclopropenes
作者:Pavel Ryabchuk、Jonathon P. Matheny、Marina Rubina、Michael Rubin
DOI:10.1021/acs.orglett.6b03068
日期:2016.12.16
An efficient approach toward enantioenriched eight-membered heterocycles via the intramolecular formal substitution of bromocyclopropanes with oxygen-based nucleophiles has been developed. The reaction proceeds via a reactive cyclopropene intermediate, which undergoes a rapid 8-endo-trig cyclization affording cis-fused [6.1.0] bicyclic products exclusively. The quaternary chiral center in the cyclopropene