A number of N‐acryloyl‐, N‐crotonoyl‐, N‐(3,3,3‐trifluorocrotonoyl)‐, N‐cinnamoyl‐, and N‐(3‐nitroacryloyl)‐4‐isopropyl‐ or ‐4‐phenyl‐oxazolidin‐2‐ones with geminal diphenyl substitution, i.e., 7–15, have been prepared and used for conjugate additions of organocuprate reagents (Me, iPr, Ph, 4‐MeOPh) in the β‐carbonyl (Table 2) and in the α‐carbonyl position (NO2‐derivative 11 in Scheme 3). The yields...
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