Table 1.
Isolated yield of 53.
determined by crude 1H-NMR.
quenched after 10 min.
quenched by addition of Na2S2O3 solution to −45 °C reaction.
gram scale, + 17% 52.
Isolated yield of 53.
determined by crude 1H-NMR.
quenched after 10 min.
quenched by addition of Na2S2O3 solution to −45 °C reaction.
gram scale, + 17% 52.