A General Method for Imine Formation Using B(OCH2CF3)3
摘要:
Tris(2,2,2-trifluoroethyl)borate [B(OCH2CF3)(3)] was found to be a mild and general reagent for the formation of a variety of imines by condensation of amides or amines with carbonyl compounds. N-Sulfinyl, N-toluenesulfonyl, N-(dimethylamino)sulfamoyl, N-diphenylphosphinoyl, N-(alpha-methylbenzyl), and N-(4-methoxyphenyl) aldimines are all accessible using this reagent at room temperature. The reactions are operationally simple, and the products are obtained without special workup or isolation procedures.
The present invention relates to a method of enantioselective addition to imines, including: reacting R
3
CH═NY with R
4
ZnR
5
in the presence of a compound represented by the following formula (I),
in which Y, R
1
, R
2
, R
3
, R
4
and R
5
are defined the same as the specification. Accordingly, the present invention can prepare secondary amines in high yields and enantiomeric excess by the above-mentioned method.
<i>syn</i>-Selective Direct Catalytic Asymmetric Mannich-Type Reactions of Aromatic and Heteroaromatic Hydroxy Ketones Promoted by Y[N(SiMe<sub>3</sub>)<sub>2</sub>]<sub>3</sub>/Linked-BINOL Complexes
Full details of syn-selective catalyticasymmetric direct Mannich-type reactions of aromatic and heteroaromatic hydroxy ketones promoted by Y[N(SiMe3)2]3/linked-BINOL complexes are described. From ...
[EN] SIMPLE ORGANIC MOLECULES AS CATALYSTS FOR PRACTICAL AND EFFICIENT ENANTIOSELECTIVE SYNTHESIS OF AMINES AND ALCOHOLS<br/>[FR] MOLÉCULES ORGANIQUES SIMPLES EN TANT QUE CATALYSEURS POUR LA SYNTHÈSE ÉNANTIOSÉLECTIVE PRATIQUE ET EFFICACE D'AMINES ET D'ALCOOLS
申请人:TRUSTEES BOSTON COLLEGE
公开号:WO2013131043A1
公开(公告)日:2013-09-06
The present invention provides organic molecules and methods thereof for reactions between organoboron reagents and double bonds, such as imines or carbonyls, to stereoselectively provide chiral products including amines and alcohols, entities useful for the preparation of biologically active molecules.
Direct-type catalytic Mannich reactions of amides with imines
作者:Susumu Saito、Tetsu Tsubogo、Sh? Kobayashi
DOI:10.1039/b618490a
日期:——
Direct-type catalytic Mannich reactions of amides with imines proceeded smoothly using barium phenoxide as a catalyst to afford the desired adducts in high yields with high anti selectivities.
An anti-selective directcatalyticasymmetricMannich-typereaction is described. The Et(2)Zn/(S,S)-linked-BINOL 1 = 4/1 complex promoted a Mannich-typereaction of 2-hydroxy-2'-methoxyacetophenone (2) and N-diphenylphosphinoyl imines 3. Using as little as 0.25-1 mol % of the catalyst, we obtained Mannich adducts 4 in excellent yield (up to 99%), diastereoselectivity (anti/syn = up to >98/2), and enantiomeric