Rh-Catalyzed, Regioselective, C–H Bond Functionalization: Access to Quinoline-Branched Amines and Dimers
作者:M. Damoder Reddy、Frank R. Fronczek、E. Blake Watkins
DOI:10.1021/acs.orglett.6b02848
日期:2016.11.4
Rh-catalyzed, chelation-induced, C-5 regioselectiveC–Hfunctionalization of 8-amidoquinolines with a range of N-Boc aminals is reported for the first time. The addition of in situ generated imines to C(sp2)–H bonds afforded branched amines in good to excellent yields. Moreover, this transformation features good functional group compatibility, broad substrate scope, and mild reaction conditions and
Activated Imines and Aminal Derivatives: Potential Precursors Of β-Amino Acids
作者:A. Milenkovic、F. Fache、R. Faure、M. Lemaire
DOI:10.1080/00397919908086133
日期:1999.5
Abstract Sulfonylimines and activated bisaminal derivatives can be easily synthesized using aldehydes and sulfonamides, carbamates, ureas or amides. Such precursors can be transformed in good yield into (3-amino acid precursors by using Lewis acid and/or base catalyzed reactions.
A process for producing polyurethane useful as coating material, which comprises preparing dialkyl carbonate substantially without using phosgene, reacting the carbonate with a diamine to give a urethane, thermally decomposing it into a diisocyanate, and converting it into a polyurethane in the presence of a Lewis acid and/or a protonic acid. The reaction of a diisocyanate compound containing a reduced amount of chlorine is promoted by a Lewis acid and/or a protonic acid.
Molybdate and silica sulfuric acids as heterogeneous alternatives for synthesis of gem-bisamides and bisurides from aldehydes and amides, carbamates, nitriles or urea
作者:Fatemeh Tamaddon、Hossein Kargar-Shooroki、Abbas Ali Jafari
DOI:10.1016/j.molcata.2012.12.002
日期:2013.3
Molybdate sulfuric acid (MSA) and silica sulfuric acid (SSA) has been prepared and used as efficient solid catalysts for the synthesis of gem-bisamides and bisurides via the one-pot three-component reaction of two moles of amides, nitriles, carbamates or urea with aldehydes. The catalytic efficiency of SSA, MSA, or H2SO4 98% per H+ sites as turnover number (TON), turnover frequency (TOF), and atomic economy (AE) was calculated and compared for quantitative evaluation of catalysts. The AE, TON, and TOF factors show the superiority of the SSA versus MSA and H2SO4. Short reaction times, simple work-up, chemoselectivity, low loading, and reusability of solid acid catalysts are extra advantages than current methods reported in the literature with corrosive acidic catalysts. (C) 2012 Elsevier B.V. All rights reserved.
Platinum-catalyzed allylation of carbon electrophiles with alkenylsilanes
In the presence of catalytic amounts of PtCl2 and AgSbF6, (Z)-alkenylsilanes react with various carbon electrophiles at the gamma-position to give allylation products. A plausible mechanism for the Pt-catalyzed allylation involves alkene migration of alkenylsilanes to allylsilanes and subsequent allylation of carbon electrophiles. (C) 2014 Elsevier Ltd. All rights reserved.