A straightforward procedure for the synthesis of enantiopure polysubstituted piperidines is reported. It involves the direct generation of chiral non-racemic oxazolo[3,2-a]piperidone lactams that already incorporate carbon substituents on the heterocyclic ring and the subsequent removal of the chiralauxiliary. The key step is a cyclocondensation reaction of (R)-phenylglycinol or other amino alcohols
The synthesis of some new pyrido[1′,2′:1,2]azepino[3,4-b]indoles starting from indole-3-propanamine 1 is described. Stereochemistry and observed side reactions are discussed.
描述了从吲哚-3-丙胺1开始合成一些新的吡啶并[1',2':1,2] azepino [3,4- b ]吲哚。讨论了立体化学和观察到的副反应。
Synthesis of vinca alkaloids and related compounds LXXXIII unexpected Pictet-Spengler side-reaction
Subjection of tryptamine 1 to the action of aldehyde 2d a substantial amount of dimeric naphthyridine 5 was formed along with the indolo-quinolizidine derivatives 6a and 6b.
使色胺1经受醛2d的作用,形成了大量的二聚萘啶5和吲哚-喹喔啉衍生物6a和6b。
Preparation of butyrolactones
申请人:BASF Aktiengesellschaft
公开号:US04324727A1
公开(公告)日:1982-04-13
A process for the preparation of a butyrolactone of the general formula ##STR1## where R.sup.1 is unsubstituted or substituted alkyl or phenyl and R.sup.2 to R.sup.6 are hydrogen or unsubstituted or substituted alkyl or phenyl, wherein a .gamma.-formylcarboxylic acid ester of the formula ##STR2## where R is lower alkyl, is treated with oxygen at an elevated temperature of 60.degree.-150.degree. C.