(3R,4R,5R)-7,7-dimethyl-5-vinyl-1,6-dioxaspiro[2.5]octan-4-ol 、
(S,E)-5-(((2R,3R,5S,6S)-2,5-dimethyl-6-((E)-3-methyl-4-oxobut-2-en-1-yl)tetrahydro-2H-pyran-3-yl)amino)-5-oxopent-3-en-2-yl morpholine-4-carboxylate 在
1,3-bis-(2,4,6-trimethylphenyl)-2-(imidazolidinylidene)dichloro(5-nitro-2-isopropoxyphenylmethylene)ruthenium 、
对苯醌 作用下,
以
1,2-二氯乙烷 为溶剂,
以36%的产率得到[(2S)-5-[[(2R,3R,5S,6S)-6-[(2E,4E)-5-[(3R,4R,5R)-4-hydroxy-7,7-dimethyl-1,6-dioxaspiro[2.5]octan-5-yl]-3-methylpenta-2,4-dienyl]-2,5-dimethyloxan-3-yl]amino]-5-oxopentan-2-yl] morpholine-4-carboxylate