Gram scale synthesis of the C(1)–C(9) fragment of amphidinolide C
作者:Nicholas A. Morra、Brian L. Pagenkopf
DOI:10.1016/j.tet.2013.07.026
日期:2013.10
Subsequent manipulations, including a Still–Gennari olefination, Sharpless asymmetric dihydroxylation, Corey–Fuchs alkynylation, and Kazmaier hydrostannylation provided the fully functionalized C(1)–C(9) fragment 2 suitable for cross-coupling. The sequence is readily scalable and provides gram quantities of 2.
BF<sub>2</sub>OBn·OEt<sub>2</sub>: A Lewis Acid, Its Use in a Regio- and Stereoselective Opening of Trisubstituted Epoxides, and Its Application towards Amphidinolide C and F
作者:Nicholas A. Morra、Brian L. Pagenkopf
DOI:10.1002/ejoc.201201331
日期:2013.2
The generation of a new Lewisacid (BF2OBn·OEt2) has been reported, and its usefulness has been demonstrated in the regio- and stereoselectivering-opening of trisubstituted epoxides. This Lewisacid is one in a series of new Lewisacids generated from BF3·OEt2 that display varying levels of Lewis acidity. When paired with a modified Shi epoxidation protocol, highly functionalized propionate units