The bisoxazole containing natural product O-methyl siphonazole was assembled using a suite of microreactors via a flow-based approach in concert with traditional batch methods. The use of a toolbox of solid-supported scavengers and reagents to aid purification afforded the natural product in a total of nine steps.
On the Effect of Tether Composition on<i>cis</i>/<i>trans</i>Selectivity in Intramolecular Diels-Alder Reactions
作者:Michael N. Paddon-Row、Alistair I. Longshaw、Anthony C. Willis、Michael S. Sherburn
DOI:10.1002/asia.200800352
日期:2009.1.5
[XZ=CH2CH2 (1); OC(O) (2); CH2C(O) (3); OCH2 (4); NHC(O) (5); SC(O) (6); OC(S) (7); NHC(S) (8); SC(S) (9)]. For each system studied (1–9), cis‐ and trans‐TS isomers, corresponding, respectively, to endo‐ and exo‐positioning of the CXZ tether with respect to the diene, have been located and their relative energies (ErelTS) employed to predict the cis/trans IMDA product