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