A straight forward entry to alpha,alpha-dideutero-beta-amino esters starting from the corresponding imines and deuterated acetonitrile has been developed involving a two-step process. (C) 2012 Elsevier Ltd. All rights reserved.
A straight forward entry to alpha,alpha-dideutero-beta-amino esters starting from the corresponding imines and deuterated acetonitrile has been developed involving a two-step process. (C) 2012 Elsevier Ltd. All rights reserved.
One-Pot Reductive N-Alkylation with Carbonyl Compounds To Give Tertiary Amines via Borane Reduction of Imines
作者:Tetsuo Ohta、Masashi Tokizane、Kaori Sato、Yuki Sakami、Yoichiro Imori、Chika Matsuo、Yoshihiko Ito
DOI:10.1055/s-0029-1217076
日期:2010.1
borane-mediated reduction of imines and reductive N-alkylation with carbonylcompounds is described. This protocol’s reducing agent is only borane in the reduction of imines, and additional reductant is not necessary in reductive N-alkylation step. When using more than two equivalents of aldehydes, reductive N-alkylation proceeded in good yield. reductive N-alkylation -boranereduction- imines - tertiary
The reaction of [Pt(2)Me(4)(mu-SMe(2))(2)] (1) with imines 3,4-(OMe)(2)C6H3CH=NCH(2)Ph (2c) and 3-MeC(6)H(6)CH=NCH(2)Ph (2e) yields cyclometallated compounds [PtMe(3,4-(OMe)(2)C6H2CH=NCH(2)Ph)(SMe(2))] (4c) and [PtMe(3-MeC(6)H(3)CH=NCH(2)Ph)(SMe(2))] (4e) arising from selective metallation at the less hindered of the two non-equivalent ortho positions of the aryl ring, followed by loss of methane. These compounds react with PPh(3) to give cyclometallated compounds [PtMe(3,4-(OMe)(2)C6H2CH=NCH(2)Ph)(PPh(3))] (5c) and [PtMe(3-MeC(6)H(3)CH=NC(2)Ph)(PPh(3))] (5e). Imines 2,4,6-(OMe)(3)C6H2CH=NCH(2)Ph (2a), 3,5-(OMe)(2)C6H3CH=NCH(2)Ph (2b) and 2,5-Me(2)C(6)H(3)CH=NCH(2)Ph (2d) coordinate to platinum through the nitrogen atom to yield compounds [PtMe(2)(ArCH=NCH(2)Ph)(SMe(2))] (3) but fail to produce cyclometallated compounds.