“…Compounds 10a and 10b did not require any further purification, while compounds 10c-f were purified by column chromatography (silica gel, hexane-EtOAc,). (2R*,3aR*,6aS*)-2-Butylhexahydrofuro[2,3-b]furan (10d 129 (31), 128 (16), 117 (11), 115 (16), 107 (21), 105 (21), 104 (22), 91 (21), 84 (100), 83 (19), 77 (22), 70 (22), 69 (14), 56 (15), 55 (20).…”