Preparation of Cyclic .ALPHA.-Hydroxy Ketones from .DELTA.- and .EPSILON.-Keto Acids Induced by the Generation of a Novel Acyl Anion Equivalent from the Carboxyl Group.
An improved method for the transformation of keto acids into cyclic α-hydroxy ketones, induced by the electrochemical generation of a novel acyl anion equivalent from the carboxy group, has been developed. Both five- and six-membered rings were constructed by constant-current electrolysis of δ- and ε-keto acids in the presence of Bu3P using an undivided cell equipped with a graphite anode and a Pt cathode. Attempts to prepare four- and seven-membered ring carbocycles were unsuccessful. The electrochemical reaction was found to be highly stereoselective when cyclization took place onto cyclopentanone and substituted cyclohexanone rings. Stereochemical aspects of the formation of bicyclic products, especially those having a bicyclo[4.3.0]skeleton, are discussed.
Stereochemical studies. X. Synthesis of some epimeric δ-lactones
作者:Ellen Cooke、Themistocles C. Paradellis、John T. Edward
DOI:10.1139/v82-006
日期:1982.1.1
Stereospecific syntheses are reported for the δ-lactones 3, 5, 8, 17, and 26.
报道了δ-内酯3、5、8、17和26的立体特异性合成。
Efficient synthesis of substituted δ-oxo acids
作者:Nicole Langlois、Nathalie Dahuron
DOI:10.1016/s0040-4039(00)88508-1
日期:1990.1
Activated α,β-unsaturated oxazolines are reactive Michael acceptors in the addition of silyl enol ethers, leading to δ-oxo acids after acidic hydrolysis.
活化的α,β-不饱和恶唑啉是甲硅烷基烯醇醚的加成反应性迈克尔受体,在酸性水解后产生δ-氧代酸。
Compounds useful for inhibition of farnesyl protein transferase
申请人:——
公开号:US20010007870A1
公开(公告)日:2001-07-12
Novel compounds of the formula:
1
are disclosed. In Formula 1.0 a represents N or NO, R
1
and R
3
are halo, R
2
and R
4
are independently H or halo provided that at least one is H, X is C, CH or N, and R represents a cycloalkyl or a heterocycloalkyl ring that is substitued.
Also disclosed are methods of inhibiting farnesyl protein transferase and methods for treating tumor cells.
式中的新型化合物:
1
的新型化合物。在式 1.0 中,a 代表 N 或 NO,R
1
和 R
3
是卤代物,R
2
和 R
4
独立地为 H 或卤代,但至少有一个为 H,X 为 C、CH 或 N,R 代表被取代的环烷基或杂环烷基环。
还公开了抑制法呢基蛋白转移酶的方法和治疗肿瘤细胞的方法。
The Synthesis of Octahydrocoumarins and their Reaction with Phosphorus Pentoxide