Scheme 8. Crossover Studies.
(i) (+)-BTM (20 mol %), iPr2NH (1.4 equiv), 25a (0.5 equiv), 31 (0.5 equiv), d3-MeCN/d6-DMSO (9:1), 253 K, 4 h; (ii) (+)-BTM (20 mol %), HOBt (20 mol %), iPr2NH (1.4 equiv), 26b (0.5 equiv), 33 (0.5 equiv), MeCN, 253 K.
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