One‐Pot Catalytic Enantioselective Synthesis of 2‐Pyrazolines
作者:Connor J. Thomson、David M. Barber、Darren J. Dixon
DOI:10.1002/anie.201811471
日期:2019.2.18
A scalable, one‐pot, enantioselective catalytic synthesis of 2‐pyrazolines from beta‐substituted enones and hydrazines is described. Pivoting on a two‐stage catalytic Michael addition/condensation strategy, the use of an aldehyde to generate a suitable hydrazone derivative of the hydrazine was found to be key for curtailing background reactivity and tuning the catalyst‐controlled enantioselectivity