Chemo-, Regio-, and Diastereoselective Hydrogenation of Oxopromegestone into Trimegestone over Supported Platinoids: Effects of the Transition Metal, Support Nature, Tin Additives, and Modifiers
作者:Yurii A. Ryndin、Catherine C. Santini、Denis Prat、Jean Marie Basset
DOI:10.1006/jcat.1999.2760
日期:2000.3
The selective hydrogenation of oxopromegestone (17α-methyl-17β-(1,2-dioxopropyl)-estra-4,9-dien-3-one), 1, into Trimegestone (17α-methyl-17β-(2(S)-hydroxy-1-oxopropyl)-estra-4,9-dien-3-one), 2, was carried out on various monometallic catalysts. The order of activity, Pd>Rh>Pt>Ir>Os, was almost opposite that of the chemoselectivity (selective hydrogenation of the carbonyl versus the internal olefinic
将氧代孕酮(17α-甲基-17β-(1,2-二氧丙基)-estra-4,9-dien-3-one)1选择性加氢成三聚氰胺(17α-甲基-17β-(2(S)-在各种单金属催化剂上进行羟基2-氧代丙基)-estra-4,9-dien-3-one)2的反应。活性顺序,Pd> Rh> Pt> Ir> Os,几乎与化学选择性相反(羰基相对于内部烯烃双键的选择性氢化),Os> Ir> Pt = Pd> Rh。没有金属给出任何所需的非对映选择性(21(S)-OH醇的选择性形成)。然而,二氧化硅负载的铑,钯和铂对于C 3羰基的氢化显示出100%的非对映异构体过量(de)。铂/二氧化硅2催化剂表现出低的化学选择性(24%),但是其TON活性相对较高(42×10 -3 s -1)。铂小号锡} ñ /二氧化硅2种催化剂,由SN(CH的相互作用制备3)4具有减少的Pt /二氧化硅2在H 2在室温下,表现出比的Pt