A unique rhodium-catalyzed rearrangement process: isomerization of an alkyne to a 1,3-diene with concomitant migration of a formyl group. An expeditious route to dienals from readily available 4-alkynalsElectronic supplementary information (ESI) available: experimental details. See http://www.rsc.org/suppdata/cc/b2/b200208f/
作者:Ken Tanaka、Gregory C. Fu
DOI:10.1039/b200208f
日期:2002.3.21
In CH2Cl2, [Rh(BINAP)]BF4 catalyzes the isomerization of 4-alkynals to dienals with excellent regio- and stereoselectivity; this new process compares favorably with previously reported methods for the synthesis of this class of compounds; a possible pathway for this unusual rearrangement is provided.
Rhodium-Catalyzed Synthesis of Cyclohexenones via a Novel [4 + 2] Annulation
作者:Ken Tanaka、Gregory C. Fu
DOI:10.1021/ol017308v
日期:2002.3.1
[GRAPHICS]In the presence of a rhodium catalyst, 4-alkynals react with alkynes to furnish cyclohexenones, presumably via metalacycle 1; as far as we are aware, this is the first example of the generation of this class of compounds through such a transformation. In view of the easy accessibility of 4-alkynals (alkynylmetal + alpha,beta-unsaturated aldehyde) and alkynes, this [4 + 2] cyclization constitutes an interesting new approach to functionalized cyclohexenones.
A Novel Rhodium-Catalyzed Reduction-Oxidation Process: Reaction of 4-Alkynals with Phenol to Provide<i>cis</i>-4-Alkenoates