A Delicate Balance of Energetics. Subtleties Associated with α-Ketol-Based Bridge Migration To Afford 9-Keto-10β-<i>p</i>-methoxybenzyloxytaxanes
作者:Leo A. Paquette、Ho Yin Lo、John E. Hofferberth、Judith C. Gallucci
DOI:10.1021/jo020628n
日期:2003.3.1
advancing a concise total synthesis of Taxol. Of the two closely related series examined, the first featured an exo-methylene group at C4. The second consisted of an alpha-epoxide at that site. Strikingly, the olefinic construct proved inert to attempted alpha-ketol rearrangement. In contrast, the oxiranyl derivative isomerized smoothly. The reaction sequence associated with arrival at taxane 18 is short