(20R,22R)-14-α-hydroxy-2β,3β:20,22-bis(isopropylidenedioxy)-5β,8α-cholestan-6-one;(20R,22R)-14α-hydroxy-2β,3β:20,22-bis(isopropylidenedioxy)-5β,8α-cholestan-6-one;7,8α-dihydroponasterone A 2,3:20,22-diacetonide;7,8-dihydroponasterone A 2,3:20,22-diacetonide
Regio and stereo directional oxidation of ecdysteroids and their 7,8-dihydroanalogs with ozone in pyridine
摘要:
The oxidation of ecdysteroids and their 7,8-dihydroanalogs with ozone in pyridine occurred regio- and stereoselectively at the hydroxy groups of the A ring giving 2--dehydro-3 alpha-hydroxy derivatives.
DOI:
10.1134/s1070428009080065
作为产物:
描述:
2,3:20,22-diacetonide of ponasterone A 在
palladium 10% on activated carbon 、 氢气 、 sodium 作用下,
以
甲醇 为溶剂,
反应 3.0h,
以94%的产率得到(20R,22R)-14α-hydroxy-2β,3β:20,22-bis-(isopropylidenedioxy)-5β,8α-cholestan-6-one
参考文献:
名称:
Effective and selective transformations of ecdysteroids into 7,8-dihydro analogs via catalytic hydrogenation under alkaline conditions
Transformation of ω-anhydro-20-hydroxyecdysone diacetonide into 7,8α-dihydroponasterone a and its acetonides
作者:R. G. Savchenko、Ya. R. Urazaeva、S. R. Afon’kina、I. S. Bushmarinov、L. M. Khalilov、V. N. Odinokov
DOI:10.1134/s1070428011070219
日期:2011.7
7,8 alpha-Dihydroponasterone A and its mono- and diacetonides were synthesized via catalytic hydrogenation of omega-anhydro-20-hydroxyecdysone 2,3: 20,22-diacetonide over Pd/C in methanol in the presence of sodium methoxide.