ent-7β,20-epoxy-1α,3α,6α,7α,15α-pentahydroxykaur-16-ene 6,15-diacetate (rabdolongin A) 、 2,2-二甲氧基丙烷 在
对甲苯磺酸 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 3.0h,
以8.9 mg的产率得到rabdolongin A acetonide
参考文献:
名称:
Studies on the diterpenoids of Rabdosia longituba(MIQ.) HARA. Structure of a new bitter diterpenoid, rabdolongin A, and the absolute stereochemistry of rabdolongin B(=maoecrystal D).
摘要:
From the dried aerial parts of Rabdosia longituba (MIQ) HARA, a new bitter diterpenoid, rabdolongin A (1), was isolated and its structure was elucidated on the basis of spectroscopic and chemical evidence. The absolute stereochemistry of rabdolongin B (=maoecrystal D) (6) was chemically established by correlation with trichokaurin (8) possessing known absolute stereochemistry.