Thermodynamic Control of Diastereoselectivity in the Formal Nucleophilic Substitution of Bromocyclopropanes
摘要:
A new, general, and chemoselective protocol for the formal nucleophilic substitution of 2-bromocyclopropylcarboxamides Is described. A wide range of alcohols and phenols can be employed as pronucleophiles in this transformation, providing expeditious access to trans-cyclopropanol ethers. A new mode of the selectivity control through a thermodynamic equilibrium is realized, alternative to the previously described steric and directing modes.
Formal Substitution of Bromocyclopropanes with Nitrogen Nucleophiles
作者:Joseph E. Banning、Jacob Gentillon、Pavel G. Ryabchuk、Anthony R. Prosser、Andrew Rogers、Andrew Edwards、Andrew Holtzen、Ivan A. Babkov、Marina Rubina、Michael Rubin
DOI:10.1021/jo4011798
日期:2013.8.2
A highly chemo- and diastereoselective protocol toward amino-substituted donor acceptor cyclopropanes via the formal nucleophilic displacement in bromocyclopropanes is described. A wide range of N-nucleophiles, including carboxamides, sulfonamides, azoles, and anilines, can be efficiently employed in this transformation, providing expeditious access to stereochemically defined and densely functionalized cydopropylamine derivatives.