Application of Organometallic Chemistry on Metal Surfaces to Fine Chemicals: A New Access to Trimegestone by Chemo-, Regio-, and Diastereoselective Hydrogenation of Cetaloxopromegestone on Pt/Sn/SiO2 Catalysts
作者:Valérie Gertosio、Catherine C Santini、Mostapha Taoufik、François Bayard、Jean-Marie Basset、Jean Buendia、Michel Vivat
DOI:10.1006/jcat.2000.3150
日期:2001.4
The selective hydrogenation of cetaloxopromegestone (17α-methyl-17β-(1,2-dioxopropyl)-estra-5,9-dien-3-ketal) to the ketal precursor of Trimegestone (17α-methyl-17β-(2(S)-hydroxy-1-oxopropyl)-estra-5,9-dien-3-ketal) was carried out on various silica-supported monometallic catalysts and on bimetallic platinum–tin catalysts prepared by the interaction of Sn(CH3)4 with reduced Pt/SiO2 under H2 at room
头孢恶唑酮(17α-甲基-17β-(1,2-二氧丙基)-estra-5,9-dien-3-ketal)选择性加氢成Trimegestone(17α-甲基-17β-(2(S)) -羟基-1-氧丙基)-estra-5,9-dien-3-缩酮)是在各种二氧化硅负载的单金属催化剂上以及在通过Sn(CH 3)4与还原的相互作用制得的双金属铂-锡催化剂上进行的。的Pt /二氧化硅2在H 2在室温下。选择性氢化必须立体选择性地发生在cetaloxopromegestone的C 21酮上,cetaloxopromegestone在C 20处具有另一个酮,在C 5 –C 10和C处具有两个共轭烯烃双键9 –C 11。在各种负载金属(Pd,Ru,Rh,Pt)中,Pt / SiO 2催化剂表现出较低的化学选择性(52%),但在C 21处的非对映选择性达到70%。Pt x Sn y / SiO 2催化剂的化学选择