Rhodium‐Catalyzed Vinylic C–H Functionalization of Enol Carbamates with Maleimides
作者:Satyasheel Sharma、Sang Hoon Han、Hyeim Jo、Sangil Han、Neeraj Kumar Mishra、Miji Choi、Taejoo Jeong、Jihye Park、In Su Kim
DOI:10.1002/ejoc.201600558
日期:2016.7
The rhodium(III)-catalyzed direct C–H functionalization of enol carbamates with a range of maleimides is described. With the assistance of the carbamoyl directing group, this reaction provides biologically relevant succinimide compounds by proceeding through a C–Rh addition and subsequent protonation pathway.
A mild, efficient, and general Negishi cross coupling protocol, 4 + 5 → 6 is reported; the hydrolysis of products 6 to acetophenones demonstrates the anionicFriedel-Craftsequivalency of the overall synthetic operation.
α-Aryl O-vinyl carbamates. Tandem carbolithiation — α-alkylation and -[1,2]-Wittig rearrangement reactions
作者:Stefano Superchi、Nuria Sotomayor、Guobin Miao、Babu Joseph、Michael G Campbell、Victor Snieckus
DOI:10.1016/0040-4039(96)01315-9
日期:1996.8
Efficient, one-pot carbolithiation — α-alkylation and -[1.2]-Wittigrearrangement processes of α-arylO-vinylcarbamates 1 to branched benzyl O-carbamates 3 and 2-aryl-2-hydroxypropionamides 4, including Naproxen analogues, is described.
kinetically inert in cross-coupling reactions compared to those of carbon–halogen bonds. Thus, developing methodologies for the activation of CO bonds in cross-coupling reactions remains a major challenge. We disclose an unprecedented nickel mediated cross-coupling of carbamates with silylmagnesium reagents that does not require the expensive silylboranes. Silylmagnesium reagents were prepared from either silyllithium