Formal Total Synthesis of Brevisamide by Using a Tandem Isomerization/C-O and C-C Bond Formation Reaction
作者:Shivalal Banoth、Saurabh Maity、Sudheer R. Kumar、J. S. Yadav、Debendra K. Mohapatra
DOI:10.1002/ejoc.201600142
日期:2016.5
stereoselective formaltotalsynthesis of brevisamide is described that proceeds through a convergent pathway and utilizes our own tandem isomerization/C–O and C–C bond formation reaction as the key step to construct the trans-2,6-disubstituted dihydropyran ring system. Other significant reactions in this synthesis include an iodolactonization, a Crimmins-modified “non-Evans” syn aldol reaction, and a Ho
The second total synthesis of Brevisamide, a marine cyclic ether alkaloid from Karenia brevis, is reported. This streamlined synthesis proceeds in 21 steps, 14 steps longest linear sequence, in 5.2% overall yield and features a key Sml(2) reductive cyclization step to access the tetrasubstituted pyran core.