苯甲醛 、
2-Dimethylamino-3,3-dimethyl-cyclobutanecarboxylic acid ethyl ester 在
盐酸 、
四氯化钛 作用下,
生成 (2S,3S)-6-Hydroxy-5,5-dimethyl-2-phenyl-tetrahydro-pyran-3-carboxylic acid ethyl ester 、 (2S,3R)-6-Hydroxy-5,5-dimethyl-2-phenyl-tetrahydro-pyran-3-carboxylic acid ethyl ester