Synthesis and evaluation of a new steroidal BINAP type phosphine
摘要:
The short and high yielding synthesis of a new cis-configured bissteroidal phosphine 7 is reported. The comparison of these new phosphines as ligands in ruthenium-based hydrogenation catalysts with the previously synthesized diastereomeric trans-configured phosphines 20 shows that the steroid backbone exerts only a minor influence on the enantioselection of the ruthenium catalysts and confirms that the bissteroidal phosphines behave as 'pseudo'-enantiomers in spite of their diastereomeric nature. Evidence is presented that the mode of catalyst preparation, i.e. catalyst structure, is the crucial reaction parameter which mainly determines the enantiomeric excess of the hydrogenation products. (C) 2000 Elsevier Science Ltd. All rights reserved.
An efficient and practicalarenehydrogenation procedure based on the use of heterogeneous platinum group catalysts has been developed. Rh/C is the most effective catalyst for the hydrogenation of the aromatic ring, which can be conducted in iPrOH under neutral conditions and at ordinary to medium H2 pressures (<10 atm). A variety of arenes such as alkylbenzenes, benzoic acids, pyridines, furans, are
16,17-Seco-delta 4,9(10) and -delta 4,9(10),11 steroids
申请人:Syntex (U.S.A.) Inc.
公开号:US03969412A1
公开(公告)日:1976-07-13
The novel 16,17-secoestra-4,9(10)-diene, 16,17-secoestra-4,9(10),11-triene, 16,17-secogona-4,9(10)-diene and 16,17-secogona-4,9(10)-triene compounds and the 14.beta.-isomers thereof useful as antiandrogenic agents, and methods for their preparation.
这些化合物及其14.beta.-异构体可用作抗雄激素药物,并提供了它们的制备方法。
Beflammen und Lackieren in einem Arbeitsgang
作者:Wolfgang Hauser
DOI:10.1007/bf03251061
日期:2002.12
A Total Synthesis of Estrone and 14-Isoestrone
作者:William S. Johnson、Robert G. Christiansen、Robert E. Ireland
DOI:10.1021/ja01565a065
日期:1957.4
Synthesis and evaluation of a new steroidal BINAP type phosphine
The short and high yielding synthesis of a new cis-configured bissteroidal phosphine 7 is reported. The comparison of these new phosphines as ligands in ruthenium-based hydrogenation catalysts with the previously synthesized diastereomeric trans-configured phosphines 20 shows that the steroid backbone exerts only a minor influence on the enantioselection of the ruthenium catalysts and confirms that the bissteroidal phosphines behave as 'pseudo'-enantiomers in spite of their diastereomeric nature. Evidence is presented that the mode of catalyst preparation, i.e. catalyst structure, is the crucial reaction parameter which mainly determines the enantiomeric excess of the hydrogenation products. (C) 2000 Elsevier Science Ltd. All rights reserved.