D-色氨酸 、
苯并[b]呋喃-2-甲醛 、 (1R,3S)-1-benzofuran-2-yl-2,3,4,9-tetrahydro-1-H-β-carboline-3-carboxylic acid methyl ester 在
乙酸乙酯 、
(1R,3R)-1-benzofuran-2-yl-2,3,4,9-tetrahydro-1H-β-carboline-3-carboxylic acid methyl ester 、 Intermediate 3 作用下,
以to give 2.85 g (44%) of (1R,3R)-1-benzofuran-2-yl-2,3,4,9-tetrahydro-1H-β-carboline-3-carboxylic acid methyl ester (Intermediate 4) and 950 mg (15%) of (1S,3R)-1-benzofuran-2-yl-2,3,4,9-tetrahydro-1H-p-carboline-3-carboxylic acid methyl ester (Intermediate 3) as foams的产率得到(1R,3R)-1-benzofuran-2-yl-2,3,4,9-tetrahydro-1H-β-carboline-3-carboxylic acid methyl ester