Synthesis of Medium-Ring Nitrogen Heterocycles via Palladium-Catalyzed Heteroannulation of 1,2-Dienes
作者:Richard C. Larock、Chi Tu、Paola Pace
DOI:10.1021/jo980516p
日期:1998.10.1
nitrogen heterocycles are readily prepared by the palladium-catalyzed heteroannulation of a variety of 1,2-dienes by a range of tosylamide- and amine-containing aryl and vinylic halides. The ease of ring formation is seven > eight > nine, and better results are obtained using aryl halides, rather than vinylic halides, and tosylamide functionality, rather than amine functionality. The reaction is suggested
Synthesis of (±)-isoretronecanol, (±)-curassanecine, (±)-heliotridane, (±)-tashiromine and (±)-5-epitashiromine via α-(N-carbamoyl)alkylcuprate chemistry
作者:R.Karl Dieter、Rhett Watson
DOI:10.1016/s0040-4039(02)01835-x
日期:2002.10
Vinylation of N-Boc-2-pyrrolidinylcuprate reagents with functionalized vinyl iodides followed by N-Boc deprotection and cyclization affords 1-methylidine pyrrolizidine and indolizidine carbon skeletons. Functional group manipulation of the exo-cyclic olefin provides direct synthetic entries to the pyrrolizidine alkaloids (±)-isoretronecanol, (±)-curassanecine, (±)-heliotridane or the indolizidine alkaloids