Stereoselective Bulk Synthesis of CCR2 Antagonist BMS-741672: Assembly of an All-<i>cis</i>(<i>S,R,R</i>)-1,2,4-Triaminocyclohexane (TACH) Core via Sequential Heterogeneous Asymmetric Hydrogenations
作者:Joerg Deerberg、Siva J. Prasad、Chris Sfouggatakis、Martin D. Eastgate、Yu Fan、Ramakrishnan Chidambaram、Praveen Sharma、Li Li、Richard Schild、Jale Müslehiddinoğlu、Hyei-Jha Chung、Simon Leung、Victor Rosso
DOI:10.1021/acs.oprd.6b00282
日期:2016.11.18
tert-amine, setting the third stereocenter in the all-cis cyclohexane core. The heterogeneous catalysts were recycled. Ester hydrolysis produced a γ-amino acid, isolated as its Na salt. A challenging Curtius reaction to introduce the remaining C–N bond at C-2 was strongly influenced by the presence of the basic tert-amine, providing a stereoelectronically highly activated isocyanate. Detailed mechanistic and
报道了立体化学复杂的CCR2拮抗剂BMS-741672的简明本体合成。一个独特的结构特征是手性全顺式1,2,4-三氨基环己烷(TACH)核,它是通过连续的立体控制的异种氢化反应组装而成的:由(S)-α-指导的有效Pt催化还原的β-烯氨基酯。甲基苄基胺作为一种低成本的手性模板,以及还原胺化3,4-顺式二取代的环己酮在硫化的Pt / C引入叔胺,设置在清一色第三立体中心顺环己烷核。回收非均相催化剂。酯水解产生作为其Na盐分离的γ-氨基酸。一个具有挑战性的库尔提斯反应在C-2引入剩余的C-N键通过基本的存在的强烈影响叔胺,提供了stereoelectronically高度活化的异氰酸酯。需要详细的机械和工艺知识,以便能够用酒精(t- BuOH)进行干净捕集,同时避免形成副产物,尤其是不寻常的氨基甲酰基磷酸酯。脱保护,N-乙酰化和未催化的S N将Ar与已知的4-氯喹唑啉偶联提供最终产物。所得的12