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. Author manuscript; available in PMC: 2019 Jul 12.
Published in final edited form as: Tetrahedron Lett. 2001 Feb 28;42(7):1227–1231. doi: 10.1016/S0040-4039(00)02227-9

Scheme 1.

Scheme 1.

(a) CH3CH2COCl, Et3N, CH2Cl2, 0°C, 1 h for 2a; RCO2H, DCC, DMAP, CH2Cl2, 23°C, 18–24 h for 2b and 2c; (b) TiCl4, iPr2NEt, 0°C, 1 h then R1CHO and TiCl4, CH2Cl2, −78°C, 2 h; (c) LiOH, THF–H2O, 23°C, 2–3 h; (d) LiBH4, THF, 23°C.