benzoxazole using lithium magnesates are described. The reactions occurred in tetrahydrofuran at room temperature using 1/3 equiv of lithium tributylmagnesate. As 2-lithiooxazole and 2-lithiobenzoxazole, lithium tri(2-oxazolyl)magnesate and lithium tri(2-benzoxazolyl)magnesate very rapidly and completely isomerized to the more stable 2-(isocyano)enolate and 2-(isocyano)phenolate type structures, respectively
A removable functional group strategy for regiodivergent Wittig rearrangement products
作者:Md Nirshad Alam、Lakshmi K. M.、Pradip Maity
DOI:10.1039/c8ob02221f
日期:——
[1,2] and [2,3] Wittig rearrangements are competing reaction pathways, often leading to uncontrollable product distribution. We employ a single removable functional group to fulfill the dual role of attaining a reversible [2,3] and stabilizing radical intermediate for the [1,2] path to obtain both the Wittig products selectively for a broad range of substrates.
REDUCTION OF π-DEFICIENT HETEROCYCLIC SECONDARY CARBINOLS WITH SODIUM BOROHYDRIDE/TRIFLUOROACETIC ACID
作者:Charles F. Nutaitis、Brett D. Swartz
DOI:10.1080/00304940509354979
日期:2005.10
The reduction of diarylcarbinols with sodium borohydriddtsifluoroacetic acid (TFA), a reaction developed by Gribble and co-workers in 1977, is a convenient method for the preparation of the corresponding diarylmethanes.' In 1991, Nutaitis and co-workers demonstrated that this method was also applicable to the reduction of secondary heterocyclic carbinols substituted with any combination of thiophene