呋喃 、
(1,2-O-Isopropyliden-5-O-(triphenylmethyl)-α-D-xylofuranose-3-O-yl)-phenylglyoxylat 生成 (1R,5S,6R)-6-Phenyl-2,7-dioxa-bicyclo[3.2.0]hept-3-ene-6-carboxylic acid (3aR,5R,6S,6aR)-2,2-dimethyl-5-trityloxymethyl-tetrahydro-furo[2,3-d][1,3]dioxol-6-yl ester 、 (1S,5R,6S)-6-Phenyl-2,7-dioxa-bicyclo[3.2.0]hept-3-ene-6-carboxylic acid (3aR,5R,6S,6aR)-2,2-dimethyl-5-trityloxymethyl-tetrahydro-furo[2,3-d][1,3]dioxol-6-yl ester