“…Methyl 3‐oxocyclopentanonecarboxylate :23f, 31 Yield: 82 %; 1 H NMR (400 MHz, CDCl 3 ): δ =3.68 (s, 3 H), 3.09 (quin., J =6.8 Hz, 1 H), 2.50–2.06 ppm (m, 6 H); 13 C NMR (100 MHz, CDCl 3 ): δ =216.65, 174.79, 52.22, 41.22, 40.83, 37.50, 26.63 ppm; [ α ]${{{20\hfill \atop {\rm D}\hfill}}}$ =+37.0 ( c =3.5 in CHCl 3 ); Chiral GC (CHIRALDEX G‐TA, injector T =220 °C, detector T =250 °C, column T =100 °C (isothermic), flow=1.0 mL min −1 , t minor =14.7, t major =15.3 min, 95 % ee ; HRMS m / z : calcd for C 7 H 10 O 3 : 142.06299 [ M ] + ; found 142.06301.…”