RHODIUM-CATALYZED AZACARBONYLATION OF ALLYL PHOSPHATES. THE PREPARATION OF β,γ-UNSATURATED AMIDES FROM ALLYL ALCOHOLS
作者:Shun-Ichi Murahashi、Yasushi Imada
DOI:10.1246/cl.1985.1477
日期:1985.10.5
Allyl phosphates undergo a smooth azacarbonylation reaction with amines to afford β,γ-unsaturated amides at 50 °C under CO atmosphere (20 atm) in the presence of Rh6(CO)16 catalyst and Bu4NCl co-catalyst.
在 Rh6(CO)16 催化剂和 Bu4NCl 助催化剂的作用下,烯丙基磷酸盐与胺在 50 °C 的 CO 大气(20 个大气压)中顺利发生偶氮羰基化反应,生成 β,γ-不饱和酰胺。
Aza- and oxacarbonylations of allyl phosphates catalyzed by rhodium carbonyl cluster. Selective synthesis of β, γ-unsaturated amides, esters, and acids
作者:Yasushi Imada、Ou Shibata、Shun-Ichi Murahashi
DOI:10.1016/0022-328x(93)83025-q
日期:1993.6
Rhodium-catalyzed carbonylation of allyl phosphates under CO (20 atm) at 50°C proceeds very efficiently in the presence of amines, alcohols, and water to give the corresponding β,γ-unsaturated amides, esters, and acids, respectively. These carbonylations occur with high regioselectivity at the less substituted carbon of allyl unit to give linear β,γ-unsaturated acid derivatives.
A two-step synthesis of the bioprotective agent JP4-039 from N-Boc-l-leucinal
作者:Barbara Bernardim、Antonio C.B. Burtoloso
DOI:10.1016/j.tet.2013.10.059
日期:2014.5
An expedited synthesis of the bioprotective agent JP4-039 is described from N-Boc-l-leucinal in 50% overall yield. The synthesisinvolves the use of an α,β-unsaturated diazoketone as the key intermediate, followed by a photochemical Wolff rearrangement in the presence of 4-amino-TEMPO (4-AT).