Enantioselective Synthesis of Cyanohydrins by a Novel Aluminum Catalyst
作者:Barry M. Trost、Silvia Martínez-Sánchez
DOI:10.1055/s-2005-863716
日期:——
The development of a new chiral aluminum catalyst is reported. This catalyst has been applied efficiently to the asymmetric cyanosilylation of aldehydes.
报道了一种新型手性铝催化剂的开发。该催化剂已有效地应用于醛的不对称氰基硅烷化。
Design, synthesis and application of C2‑symmetric cycloglycerodiphosphate catalysts
phosphoric acids (CPAs) and their salts are the privileged catalysts in a plethora of asymmetric transformations. All of the scaffolds of efficient CPAs rely on C2-symmetry and axial chirality, while the only examples of punctually chiral CPAs are TADDOL derivatives. Herein, we present the design and the synthesis of C2-symmetric cycloglycerophosphates (cGPAs) and their application throughout the addition
Stereoselective synthesis of thienyl and furyl analogues of ephedrine
作者:Franz Effenberger、Joachim Eichhorn
DOI:10.1016/s0957-4166(96)00528-9
日期:1997.2
The stereoselective syntheses of thienyl and furyl analogues of ephedrine starting from (R)- and (S)-cyanohydrins, respectively, are described. Addition of methyl Grignard to the O-trimethylsilyl protected optically active cyanohydrins (R)- and (S)-3 and hydrogenation of the resulting imino intermediates gives the erythro-2-amino alcohols 4 with high diastereoselectivity. Their reductive methylation