1,3-Dioxa-[3,3]-sigmatropic Oxo-Rearrangement of Substituted Allylic Carbamates: Scope and Mechanistic Studies
作者:Maddalen Agirre、Sylvain Henrion、Ivan Rivilla、José I. Miranda、Fernando P. Cossío、Bertrand Carboni、José M. Villalgordo、François Carreaux
DOI:10.1021/acs.joc.8b01320
日期:2018.12.21
alkenyl-substituted allylic alcohols with activated isocyanates is reported. The reorganization of bonds is highly dependent on the electron density of the aromatic ring and the nature of isocyanate used. This metal-free tandem reaction from branched allyl alcohols initiated by a carbamoylation reaction and followed by a sigmatropic rearrangement thus offers a new access to (E)-cinnamyl and conjugated (E,E)-diene
Regio- and diastereoselective Pd-catalyzed aminochlorocyclization of allylic carbamates: scope, derivatization, and mechanism
作者:Bruna Papa Spadafora、Francisco Wanderson Moreira Ribeiro、Jullyane Emi Matsushima、Elaine Miho Ariga、Isaac Omari、Priscila Machado Arruda Soares、Diogo de Oliveira-Silva、Elisângela Vinhato、J. Scott McIndoe、Thiago Carita Correra、Alessandro Rodrigues
DOI:10.1039/d1ob00670c
日期:——
diastereoselective synthesis of oxazolidinones via a Pd-catalyzed vicinal C–N/C–Cl bond-forming reaction from internal alkenes of allylic carbamates is reported. The oxazolidinones are obtained in yields of 44 to 95% with high to excellent diastereoselectivities (from 6 : 1 to >20 : 1 dr) from readily available precursors. This process is scalable, and the products are suitable for the synthesis of useful amino
Palladium-Catalyzed Ring-Forming Aminoacetoxylation of Alkenes
作者:Erik J. Alexanian、Chulbom Lee、Erik J. Sorensen
DOI:10.1021/ja051406k
日期:2005.6.1
A mild, palladium(II)-catalyzed ring-forming aminoacetoxylation of alkenes is described. Treatment of a range of nitrogennucleophiles with catalytic palladium(II) in the presence of PhI(OAc)2 as oxidant resulted in alkene aminoacetoxylation, affording a variety of nitrogen-containing heterocycles. Our studies indicate the possibility for high levels of reaction regio- and stereocontrol. It appears
描述了一种温和的、钯 (II) 催化的烯烃成环氨基乙酰氧基化。在 PhI(OAc)2 作为氧化剂的存在下,用催化钯 (II) 处理一系列含氮亲核试剂,导致烯烃氨基乙酰氧基化,得到各种含氮杂环。我们的研究表明高水平的反应区域和立体控制的可能性。这似乎是立体选择性反式烯烃双官能化,因此是相关顺式选择性金属催化烯烃氨基羟基化过程的有用替代方法。
Palladium catalyzed arylation of N-alkyl O-allyl carbamates: Synthesis of cinnamyl alcohols via Heck arylation