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(i) PPTS, THF, H2O, 40% 16, 36% 17; (ii) CSA, hexanes, 42% 18, 32% 16, 7% 17; (iii) LiDBB, THF, −78 °C, 10 min; (iv) ClCOCH=N-NHTs, N,N-dimethylaniline, Et3N, CH2Cl2, 60% 19 over 2 steps, 65% 20 over 2 steps; (v) Rh2(4S)-(MPPIM)4, CH2Cl2, reflux, 12% 21.
