Convergent and Biomimetic Enantioselective Total Synthesis of (−)-Communesin F
作者:Stephen P. Lathrop、Matthew Pompeo、Wen-Tau T. Chang、Mohammad Movassaghi
DOI:10.1021/jacs.6b04072
日期:2016.6.22
The first biomimetic enantioselectivetotalsynthesis of (-)-communesin F based on a late-stage heterodimerization and aminal exchange is described. Our synthesis features the expedient diazene-directed assembly of two advanced fragments to secure the congested C3a-C3a' linkage in three steps, followed by a highly efficient biogenetically inspired aminal reorganization to access the heptacyclic communesin
Biomimetic Total Syntheses of Borreverine and Flinderole Alkaloids
作者:Dattatraya H. Dethe、Rohan D. Erande、Alok Ranjan
DOI:10.1021/jo4013833
日期:2013.10.18
alkaloids represent a structurally unique class of natural products having interesting biological activities. Recently, we reported the first totalsynthesis of flinderoles B and C, structurally unique and potent antimalarial natural products. Central to the design of the approach and by virtue of a one-pot, acid-catalyzed dimerization reaction, the route also provided totalsynthesis of the borreverine
Non-Pd transition metal-catalyzed hydrostannations: Bu3SnF/PMHS as a tin hydride source
作者:Robert E. Maleczka、Banibrata Ghosh、William P. Gallagher、Aaron J. Baker、Jill A. Muchnij、Amy L. Szymanski
DOI:10.1016/j.tet.2013.02.064
日期:2013.5
and rhodium catalyzed alkyne hydrostannations using in situ generated Bu3SnH were studied. In most cases, Bu3SnF+polymethylhydrosiloxane (PMHS) performed well as the in situ source of Bu3SnH. In contrast, the combination of Bu3SnCl/KFaq/PMHS, which had witnessed earlier success in Pd-catalyzed hydrostannation reactions, proved less employable in alkyne hydrostannations mediated by these metals.
Remarkable Switch of Regioselectivity in Diels–Alder Reaction: Divergent Total Synthesis of Borreverine, Caulindoles, and Flinderoles
作者:Dattatraya H. Dethe、Rohan D. Erande、Balu D. Dherange
DOI:10.1021/ol501078d
日期:2014.5.16
Switchable reaction patterns of dimerization of indole substituted butadienes via a Lewis acid and thermal activation are reported. While under acidic conditions dimerization occurred around the internal double bond of the dienophile, a complete switch of regioselectivity was observed under thermal conditions, where dimerization occurred around the terminal double bond of the dienophile. This switch
Stille Couplings Catalytic in Tin: The “Sn−O” Approach
作者:William P. Gallagher、Ina Terstiege、Robert E. Maleczka
DOI:10.1021/ja0035295
日期:2001.4.1
lle coupling protocol for the stereoselective generation of vinyltins and their subsequent union, employing only catalytic amounts of tin, is described. By recycling the organotinhalide Stille byproduct back to organotinhydride, a hydrostannylation/cross-coupling sequence can be carried out with catalytic amounts of tin. Such a process is most effective with Me(3)SnCl serving as the tin source. This