(1R,2S,7R,9R,11R,12S)-11-Acetyl-12-benzyloxy-5-methyl-1-vinyl-8-oxa-tricyclo[7.2.1.02,7]dodec-4-ene-2-carboxylic acid methyl ester 在
camphor-10-sulfonic acid 作用下,
以
乙二醇 为溶剂,
生成 (1R,2S,7R,9R,11R,12S)-11-Acetyl-12-benzyloxy-5-methyl-1-vinyl-8-oxa-tricyclo[7.2.1.0
2,7]dodec-5-ene-2-carboxylic acid methyl ester