5-benzyloxymethyl-2-(R)-methyl-(Sa)-tetradeca-3,4-dienoic acid 在
N,N-二异丙基乙胺 作用下,
以
乙腈 为溶剂,
生成 (3S,6S)-6-benzyloxymethyl-3-methyl-6-nonyl-3,6-dihydropyran-2-one 、 (3R,6R)-6-benzyloxymethyl-3-methyl-6-nonyl-3,6-dihydropyran-2-one 、 (3S,6R)-6-benzyloxymethyl-3-methyl-6-nonyl-3,6-dihydropyran-2-one 、
(3R,6S)-6-benzyloxymethyl-3-methyl-6-nonyl-3,6-dihydropyran-2-one