Total Syntheses of <i>ent</i>-Heliespirones A and C
作者:Wen-Ju Bai、Jason C. Green、Thomas R. R. Pettus
DOI:10.1021/jo201971g
日期:2012.1.6
l-lactic-acid-derived exocyclic enolether. Novel reactions of special note include a diastereoselective reduction of a chroman spiroketal by combination of borontrifluoride etherate and triethyl silane, along with oxidative rupture of a chroman etherial ring into the corresponding p-quinone by argentic oxide (AgO). In addition, an unusual intramolecular etherification of a 3° alcohol caused by cerium ammonium