Total Synthesis of Virgatolide B via Exploitation of Intramolecular Hydrogen Bonding
作者:Paul A. Hume、Daniel. P. Furkert、Margaret A. Brimble
DOI:10.1021/jo5008527
日期:2014.6.6
A full account of the enantioselective totalsynthesis of virgatolide B is reported. Key features of the synthesis include an sp3–sp2 Suzuki–Miyaura cross-coupling of a β-trifluoroboratoamide with an aryl bromide, regioselective intramolecular carboalkoxylation, and a 1,3-anti-selective Mukaiyama aldol reaction. Intramolecular hydrogen bonding governed the regioselectivity of the key spiroketalization
Enantiodivergent synthesis of both enantiomers of the macrocyclic lactone lasiodiplodin
作者:Franz Bracher、Brigitte Schulte
DOI:10.1039/p19960002619
日期:——
A straightforward approach to both enantiomers of lasiodiplodin 1 is described utilizing (S)-2-(2-hydroxypropyl)-1,3-dithiane 3 as a chiral building block. The key step is a Pd0-catalysed cross coupling of an arene trifluoromethanesulfonate with a 9-alkyl-9-borabicyclo[3.3.1]nonane derivative. The two enantiomers 1 and ent-1 have been obtained in an enantiodivergent manner by macrolactonization of the hydroxy acid 10 with either Gerlach's modification of the Corey lactonization or a Mitsunobu lactonization.