N-Heterocyclic Carbene-Catalyzed Annulation of α-Cyano-1,4-diketones with Ynals
摘要:
In this paper, the first stereoselective annulation reaction between alpha-cyano-1,4-diketones and ynals, mediated by catalytic amounts of a triazolium salt precatalyst and cocatalytic amounts of a weak carboxylate base, is disclosed. The title transformation proceeds smoothly under mild reaction conditions and generates three contiguous stereogenic centers, one of which is a quaternary acetal carbon. This reaction tolerates a wide variety of electronically distinct substituents on both reaction partners and affords privileged bicyclic scaffolds in 61-90% isolated yields and with up to 20:1 diastereomeric preference.
The chemistry of the pyrido[4,3-b]carbazoles part 15 the synthesis of unsymmetrically 1,4-disubstituted carbazoles and their use in the synthesis of 6H-Pyrido-[4,3-b]carbazoles
作者:Iain Hogan、Paul D. Jenkins、Malcolm Sainsbury
DOI:10.1016/s0040-4020(01)88387-3
日期:1990.1
Justoni, Gazzetta Chimica Italiana, 1941, vol. 71, p. 51,383
作者:Justoni
DOI:——
日期:——
Synthesis of some 2-aminofurans from cyanoacetone enolate and their rearrangement to 3-cyanopyrroles with ammonia
作者:John F. Blount、David L. Coffen、David A. Katonak
DOI:10.1021/jo00414a006
日期:1978.9
Justoni, Gazzetta Chimica Italiana, 1941, vol. 71, p. 383,384
作者:Justoni
DOI:——
日期:——
HOGAN, IAIN;JENKINS, PAUL D.;SAINSBURY, MALCOLM, TETRAHEDRON., 46,(1990) N, C. 2943-2964
作者:HOGAN, IAIN、JENKINS, PAUL D.、SAINSBURY, MALCOLM