Aminodiols via Stereocontrolled Oxidation of Methyleneaziridines
摘要:
A highly diastereoselective Ru-catalyzed oxidation/reduction sequence of bicyclic methyleneaziridines provides a facile route to complex 1-amino-2,3-diol motifs. The relative anti stereochemistry between the amine and the vicinal alcohol are proposed to result from 1,3-bischelation in the transition state by the C1 and C3 heteroatoms.
A Stereoselective [3+1] Ring Expansion for the Synthesis of Highly Substituted Methylene Azetidines
作者:Steven C. Schmid、Ilia A. Guzei、Jennifer M. Schomaker
DOI:10.1002/anie.201705202
日期:2017.9.25
The reaction of rhodium‐bound carbenes with strained bicyclic methylene aziridines results in a formal [3+1] ring expansion to yield highlysubstituted methylene azetidines with excellent regio‐ and stereoselectivity. The reaction appears to proceed through an ylide‐type mechanism, where the unique strain and structure of the methylene aziridine promotes a ring‐opening/ring‐closing cascade that efficiently