Catalytic Enantioselective Iodoaminocyclization of Hydrazones
摘要:
The first catalytic enantioselective iodoaminocyclization of beta,gamma-unsaturated hydrazones has been developed with the help of a trans-1,2-diaminocyclohexane-derived bifunctional thiourea catalyst and allows for the direct access to Delta(2)-pyrazolines containing a quaternary stereogenic center in high yield with good enantioselectivity (up to 95% yield and 95:5 er).
d domino hydrosilylation of substrates carrying unsaturated functionalities in a proximal arrangement is presented to produce silacycles. Excellent levels of efficiency and selectivity were achieved in the cyclization by the deliberate choice of the hydrosilane reagents. The key to successful cyclic hydrosilylation is the reactivity enhancement of the second intramolecular hydrosilylation by a proximity
Catalytic Enantioselective Iodoetherification of Oximes
作者:Chandra Bhushan Tripathi、Santanu Mukherjee
DOI:10.1002/anie.201304173
日期:2013.8.5
The first catalyticenantioselectiveiodoetherification of oximes is developed using commercially available N‐iodosuccinimide. In the presence of a dihydrocinchonidine‐derived thiourea (10 mol %), β,γ‐unsaturated oximes undergo facile iodoetherification to produce Δ2‐isoxazolines containing a quaternary stereogenic center generally in high yield with good to excellent enantioselectivity.
C<sub>sp<sup>3</sup></sub>–C<sub>sp<sup>3</sup></sub> Bond Cleavage in the Palladium-Catalyzed Aminohydroxylation of Allylic Hydrazones Using Atmospheric Oxygen as the Sole Oxidant
作者:Yu-Chen Chen、Ming-Kui Zhu、Teck-Peng Loh
DOI:10.1021/acs.orglett.5b01127
日期:2015.6.5
A C–C bond cleavage was observed in the palladium-catalyzed aminohydroxylation of allylic hydrazones, using atmospheric oxygen as the soleoxidant. This reaction could also proceed in a one-pot manner, starting from keto-alkene compounds and phenylhydrazine.
Palladium-Catalyzed Oxime Assisted Intramolecular Dioxygenation of Alkenes with 1 atm of Air as the Sole Oxidant
作者:Ming-Kui Zhu、Jun-Feng Zhao、Teck-Peng Loh
DOI:10.1021/ja100716x
日期:2010.5.12
This paper describes a palladium-catalyzed oxime assisted intramolecular dioxygenation of alkenes by using 1 atm of air as the sole oxidant under extremely mild conditions, which demonstrated the feasibility of incorporating atmospheric oxygen into synthetically useful products under 1 atm of air at room temperature.
SNOWDEN, ROGER L.;LINDER, SIMON M.;MULLER, BERNARD L.;SCHULTE-ELTE, KARL +, HELV. CHIM. ACTA, 70,(1987) N 7, 1858-1878
作者:SNOWDEN, ROGER L.、LINDER, SIMON M.、MULLER, BERNARD L.、SCHULTE-ELTE, KARL +