Scheme 2. Reagent and conditions:
(a) AlMe3, HN(OCH3)-CH3·HCl, CH2Cl2, 23°C, 2.5 h (93%); (b) MEMCl, DIPEA, 23°C, 9 h (92%); (c) iPrMgCl, THF, 23°C, 5 h (61%).
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