A feasibility study on the synthesis of phenylephrine via ruthenium-catalyzed homogeneous asymmetric hydrogenation
摘要:
We report a feasibility study on a new route to (R)-phenylephrine based on the ruthenium catalyzed asymmetric hydrogenation of an aminoketone precursor The direct and fast asymmetric reduction of aminoketones or their hydrochloride salts is achievable at low catalyst loadings (molar substrate to catalyst ratio S/C >25 000/1 TOF up to 25 000 h(-1)) with high enantioselectivity (>95% ee) without the need for N-protection nor isolation of the free base prior to reaction 2010 Elsevier Ltd All rights reserved
A feasibility study on the synthesis of phenylephrine via ruthenium-catalyzed homogeneous asymmetric hydrogenation
摘要:
We report a feasibility study on a new route to (R)-phenylephrine based on the ruthenium catalyzed asymmetric hydrogenation of an aminoketone precursor The direct and fast asymmetric reduction of aminoketones or their hydrochloride salts is achievable at low catalyst loadings (molar substrate to catalyst ratio S/C >25 000/1 TOF up to 25 000 h(-1)) with high enantioselectivity (>95% ee) without the need for N-protection nor isolation of the free base prior to reaction 2010 Elsevier Ltd All rights reserved
activities (up to 9800 TON; TON=turnover number), broad substrate scope (81 examples), good functional‐group tolerance, and excellent enantioselectivities (85–98 % ee) in the hydrogenation of various ketones. These aspects are rare in earth‐abundant metal catalyzed hydrogenations. The utility of the protocol have been demonstrated in the asymmetric synthesis of a variety of key intermediates for chiral drugs
已经开发了一系列含有基于核苷的手性钳式配体的Mn I配合物,这些配合物具有模块化和可调的结构。该配合物在各种酮的氢化反应中显示出前所未有的高活性(高达9800 TON; TON =周转数),广泛的底物范围(81个实例),良好的官能团耐受性和出色的对映选择性(85-98%ee)。这些方面在稀土金属催化的氢化反应中很少见。该协议的实用性已在手性药物的多种关键中间体的不对称合成中得到证明。初步的机理研究表明,底物与催化剂相互作用的外层模式可能主导了催化作用。