Enantioselective 1,6‐Conjugate Addition of Dialkyl α‐Diazo Methylphosphonate to
para
‐Quinone Methides
摘要:
AbstractAn asymmetric 1,6‐conjugate addition reaction of dialkyl diazomethylphosphonates to para‐quinone methides promoted by phase‐transfer catalysis has been developed. A series of chiral diarylmethylated diazomethylphosphonates were accessed with up to 85% yields and 99% ee enantioselectivities. The resulting products were further transformed into bioactive compounds, namely, a chiral dihydrocinnoline phosphonate and a chiral α‐aminophosphonate, bearing diarylmethine stereogenic centers.magnified image