α-(<i>N</i>-Carbamoyl)alkylcuprate Chemistry in the Synthesis of Nitrogen Heterocycles
作者:R. Karl Dieter、Kai Lu
DOI:10.1021/jo016053w
日期:2002.2.1
beta-ynoates, alpha-allenyl esters, or alpha.beta-enoates or enimides undergo N-Boc deprotection and cyclization onto the ester functionality upon treatment with PhOH/TMSCl, catecholboron bromide, or trimethylsilyl triflate. This two-pot sequence provides synthetic routes to 4-alkylidinepyrrolidine-2-ones, 4-alkylidinepyrrolizidin-2-ones, and 4-alkylidineindolizidin-2-ones via allenylesters; pyrrolin-2-ones
Das, Suresh; Kumar, J. S. Dileep; Shivaramayya, K., Journal of the Chemical Society. Perkin transactions I, 1995, # 14, p. 1797 - 1800
作者:Das, Suresh、Kumar, J. S. Dileep、Shivaramayya, K.、George, M. V.
DOI:——
日期:——
Hydrogenation of pyrrolizin-3-ones; new routes to pyrrolizidines
作者:Xavier L. M. Despinoy、Hamish McNab
DOI:10.1039/b910199c
日期:——
catalysts. Good diastereoselectivity (up to >97:3, depending on catalysts and solvent) can be achieved if the pyrrolizin-3-one is substituted at the 1- (or 7-) position(s), but the selectivity is reduced if both positions are substituted. Subsequent deoxygenation of the pyrrolizidin-3-ones provides concise, diastereoselectiveroutes to the necine bases (±)-heliotridane 5, (±)-isoretronecanol 6 and (±)retronecanol