Iridium(III)-Catalyzed Selective and Mild C-H Amidation of Cyclic <i>N</i>
-Sulfonyl Ketimines with Organic Azides
作者:Manikantha Maraswami、Gang Chen、Teck-Peng Loh
DOI:10.1002/adsc.201700785
日期:2018.2.1
A general protocol for iridium catalyzed direct C−H amidation of cyclic N-sulfonyl ketimines using sulfonyl, acyl and arylazides as nitrogen source is reported herein. The reaction takes place at roomtemperature with acyl and arylazides, while an elevated temperature needed with sulfonylazides to furnish aminated sultams in excellent yields with complete chemo and regioselectivity, thus providing
MODIFIED BOROHYDRIDE AGENTS, BIS (TRIPHENYLPHOSPHINE) (TETRA-HYDROBORATO)ZINC COMPLEX [Zn(BH<sub>4</sub> <sub>2</sub>(PPh<sub>3</sub>)<sub>2</sub>] AND (TRIPHENYLPHOSPHINE) (TETRAHYDROBORATO)ZINC COMPLEX [Zn(BH<sub>4</sub>)<sub>2</sub>(PPh<sub>3</sub>)]. NEW LIGAND METAL BOROHYDRIDES AS STABLE, EFFICIENT, AND VERSATILE REDUCING AGENTS
作者:Habib Firouzabadi、Mina Adibi、Mahboobeh Ghadami
DOI:10.1080/10426509808029675
日期:1998.11.1
corresponding mines and amides are described. Bis(triphenylphosphine)(tetrahydroboratro)zinc complex shows promising shelf stability and is much more stable than its mono triphenylphosphine analogue. The reducing ability of the two complexes is more or less the same.
Modified Borohydride Agents; Efficient Reduction of Azides with (1,4-Diazabicyclo[2.2.2]octane) (Tetrahydroborato)zinc Complex [Zn(BH<sub>4</sub>)<sub>2</sub>(dabco)] and Methyltriphenylphosphonium Tetrahydroborate [MePh<sub>3</sub>P<sup>+</sup>BH<sub>4</sub><sup>−</sup>]
作者:H. Firouzabadi、M. Adibi、B. Zeynizadeh
DOI:10.1080/00397919808005968
日期:1998.4
Abstract (1,4-Diazabicyclo[2.2.2]octane)(tetrahydroborato)zinc complex and methyltriphenylphosphonium tetrahydroborate are stable modified borohydrides which are used for the efficient reduction of aryl, alkyl, and aroyl azides with excellent yields in THF or CH2Cl2 at room temperature or under reflux conditions.
BUTYLTRIPHENYLPHOSPHONIUM TETRAHYDROBORATE (BTPPTB) AS A SELECTIVE REDUCING AGENT FOR REDUCTION OF ORGANIC COMPOUNDS
作者:Abdol Reza Hajipour、Shadpour E. Mallakpour
DOI:10.1081/scc-100104001
日期:2001.1.1
Butyltriphenylphosphonium tetraborate (BTPPTB) (1) has been found to be a selective and versatile reducing agent. The reagent in dichloromethane solution or under solvent-free conditions is very useful for reduction of aldehydes, ketones, carboxylic acid chlorides, aryl azides, and aroyl azides to the corresponding alcohols, amines and amides, respectively.
T3P® (propylphosphonic anhydride) mediated conversion of carboxylic acids into acid azides and one-pot synthesis of ureidopeptides
作者:Basavaprabhu、N. Narendra、Ravi S. Lamani、Vommina V. Sureshbabu
DOI:10.1016/j.tetlet.2010.04.002
日期:2010.6
A general, mild, efficient, and environmentally benign protocol, which makes use of T3P® as an acid activating agent for the direct synthesis of acid azides from carboxylic acids is described. Further, the protocol is employed for the one-potsynthesis of α-ureidopeptides starting from N-protected α-amino acids.