1-chloro-2-methyl-2(E)-octen-6-yne 以
neat (no solvent) 为溶剂,
反应 50.0h,
生成 [(R)-2-((R)-1-Isopropenyl-hex-4-ynyl)-6-methoxy-3,4-dihydro-2H-naphthalen-(1Z)-ylidene]-trimethylsilanyloxy-acetonitrile
参考文献:
名称:
(.+-.)-11-酮孕酮的合成,皮质类固醇的前体。一种将碳 19 甲基引入 A 环芳香族甾体的改进方法
摘要:
Lastereochimie C 8 -C 14 du steroide est etablie, par une transposition de Cope permettant la形成立体控制的 C et D par cyclisations en milieu acide。La Formation d'un groupe hydroxy-11β permet l'introductionstereocontrolee dumethyl 19 en protegeant la fonction cetone en -3 par un acetal
(.+-.)-11-酮孕酮的合成,皮质类固醇的前体。一种将碳 19 甲基引入 A 环芳香族甾体的改进方法
摘要:
Lastereochimie C 8 -C 14 du steroide est etablie, par une transposition de Cope permettant la形成立体控制的 C et D par cyclisations en milieu acide。La Formation d'un groupe hydroxy-11β permet l'introductionstereocontrolee dumethyl 19 en protegeant la fonction cetone en -3 par un acetal
申请人:The Board of Trustees of Leland Stanford Jr. University
公开号:US04129599A1
公开(公告)日:1978-12-12
Method is provided for cyclization of polyunsaturated substituted acylic or monocarbocyclic initiator group containing compound having an endocyclic double bond with a chalcogen atom in the allylic position of the initiator group and having at least two sites of unconjugated aliphatic unsaturation in the side chain substituent on the ring. The polyunsaturated compound is cyclized in the presence of a strong acid in a protic solvent which is inert to the acid, preferably a hydroxylic solvent. Mild temperatures and varying times are employed. The products are useful primarily as intermediates for naturally occurring and synthetic steroids. By appropriate substitution of the side chain, the steroidial products are provided with the substituent at C-11, which upon cyclization results in the alpha-configuration. By resolution of the intermediates prior to cyclization, optically active steroids can be obtained.
Olefinically unsaturated substituents at C-11 of steroid cyclization
申请人:The Board of Trustees of Leland Stanford Junior University
公开号:US04064185A1
公开(公告)日:1977-12-20
Compositions are provided as well as methods for preparing the compositions which serve as cyclization precursors for the preparation of C-11 alkenyl substituted steroids and nor-steroids. The alkenyl group may be converted after cyclization to a variety of heterosubstituents to provide heterofunctionalized C-11 steroids and nor-steroids. The compounds are provided having an initiator group, which has a chalcoxy atom in juxtaposition to a double bond, an olefinically unsaturated linking group and a terminating group which acts to from a carbocation which reacts with a nucleophile to provide a stable product. The C-11 substituent is found to provide upon cyclization the alpha-configuration, so that the subject compounds provide a direct route to the difficultly accessible alpha-C-11 substituted steroids, or, if desired, the alpha-configuration can be inverted to the beta-configuration.