(4S,5R,6S)-4-{[(S)-1-Carboxy-2-(1H-indol-3-yl)-ethylcarbamoyl]-methyl}-6-((2S,3R,4S,5R,6R)-3,4,5-triacetoxy-6-acetoxymethyl-tetrahydro-pyran-2-yloxy)-5-vinyl-5,6-dihydro-4H-pyran-3-carboxylic acid methyl ester 在
N,N'-二环己基碳二亚胺 作用下,
以
二氯甲烷 为溶剂,
反应 3.5h,
以25%的产率得到(S)-1-[(2S,3R,4S)-5-Methoxycarbonyl-2-((2S,3R,4S,5R,6R)-3,4,5-triacetoxy-6-acetoxymethyl-tetrahydro-pyran-2-yloxy)-3-vinyl-3,4-dihydro-2H-pyran-4-ylmethyl]-4,9-dihydro-3H-β-carboline-3-carboxylic acid