Highly Chemoselective Reduction of Amides (Primary, Secondary, Tertiary) to Alcohols using SmI<sub>2</sub>/Amine/H<sub>2</sub>O under Mild Conditions
作者:Michal Szostak、Malcolm Spain、Andrew J. Eberhart、David J. Procter
DOI:10.1021/ja412578t
日期:2014.2.12
Highly chemoselective direct reduction of primary, secondary, and tertiary amides to alcohols using SmI2/amine/H2O is reported. The reaction proceeds with C–N bond cleavage in the carbinolamine intermediate, shows excellent functional group tolerance, and delivers the alcohol products in very high yields. The expected C–O cleavage products are not formed under the reaction conditions. The observed
Highly Stereoselective Halocyclopropanation of α,β-Unsaturated Amides
作者:José M. Concellón、Humberto Rodríguez-Solla、Elena G. Blanco、María A. Villa-García、Noemí Alvaredo、Santiago García-Granda、M. Rosario Díaz
DOI:10.1002/adsc.200900331
日期:2009.9
A convenient highly stereoselective synthesis of chloro- and bromocyclopropanamides from di- tri- or tetrasubstituted (E)- or (Z)-α,β-unsaturatedamides with total or high stereoselectivity promoted by chromium dichloride or dibromide is described. The transformation of chlorocyclopropanamides into the corresponding ketones or amines is also reported. A mechanism to explain these transformations is
An Efficient Catalytic Chromium-Mediated Iodocyclopropanation Reaction: Stereoselective Synthesis of Iodocyclopropanecarboxamides
作者:José M. Concellón、Humberto Rodríguez-Solla、Elena G. Blanco、Santiago García-Granda、and M. Rosario Díaz
DOI:10.1002/adsc.201000574
日期:2011.1.10
catalytic chromium‐mediated novel synthesis of iodocyclopropanecarboxamides is reported. This reaction can be carried out on aromatic (E)‐ or (Z)‐α,β‐unsaturated amides in which the CC double bond is di‐ or trisubstituted. This process takes place with total stereospecificity and the new CI stereogenic center is generated with high stereoselectivity. Some synthetic applications of the obtained iodocyclopropanecarboxamides
substituted cyclopropanecarboxylic acidamides with [(Ph3PAu)3O]BF4 (I) has been studied. The reaction of I with cyclopropanecarboxylic acid p-nitroanilide leads to the gold derivative with the AuN bond, the small cycle being unaltered. The interactions between lithiated cyclopropanecarboxylic acid N,N-diethylamides and I afford the organogold derivatives of the amides with gold bonded to the carbon of
Sequenced elimination–reduction and elimination–cyclopropanation reactions of 2,3-epoxyamides promoted by samarium diiodide. Synthesis of 2,3-dideuterioamides and cyclopropanamides
作者:José M. Concellón、Mónica Huerta、Eva Bardales
DOI:10.1016/j.tet.2004.07.051
日期:2004.10
An easy and general sequenced elimination/reduction or elimination/cyclopropanation process promoted by samarium diiodide or/and CH2I2/Sm provide an efficient method for synthesising 2,3-dideuterioamides 3 or cyclopropanamides 8, respectively. The transformations take place in high yields and with total or high selectivity from the easily available 2,3-epoxyamides. (C) 2004 Elsevier Ltd. All rights reserved.