Synthesis ( IF 2.2 ) Pub Date : 2018-06-29 , DOI: 10.1055/s-0036-1591594 Hugo Campello 1 , Timothy Gallagher 1 , Aurélien Honraedt 1 , Worawat Niwetmarin 1 , Cecilia Gotti 2
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Abstract
The high regioselectivity associated with the iridium-catalysed borylation of pyridones has been exploited to provide a very direct and efficient entry to C(10) doubly substituted CC4 variants of cytisine. Two approaches have been evaluated based on (i) C–H activation of cytisine (or an N-substituted derivative) followed by N-alkylation (to enable dimer formation) and (ii) direct C–H activation and borylation of CC4 itself. Both approaches provide access to C(10)-functionalized CC4 derivatives, but direct borylation of CC4 allows for a wider range of functional group interconversions to be tolerated.
The high regioselectivity associated with the iridium-catalysed borylation of pyridones has been exploited to provide a very direct and efficient entry to C(10) doubly substituted CC4 variants of cytisine. Two approaches have been evaluated based on (i) C–H activation of cytisine (or an N-substituted derivative) followed by N-alkylation (to enable dimer formation) and (ii) direct C–H activation and borylation of CC4 itself. Both approaches provide access to C(10)-functionalized CC4 derivatives, but direct borylation of CC4 allows for a wider range of functional group interconversions to be tolerated.
中文翻译：
铱催化2-吡啶酮的CH硼氢化；CC4的双功能化
摘要
与铱催化的吡啶酮的硼化作用相关的高区域选择性已被利用来提供一个非常直接和有效的进入胱氨酸的C（10）双取代的CC4变体的途径。基于（i）半胱氨酸（或N-取代的衍生物）的C–H活化，随后的N-烷基化（以使二聚体形成）和（ii）CC4的直接C–H活化和硼化，已评估了两种方法。两种方法都提供了对C（10）-官能化CC4衍生物的访问，但是CC4的直接硼酸酯化允许更广泛的官能团互变。
与铱催化的吡啶酮的硼化作用相关的高区域选择性已被利用来提供一个非常直接和有效的进入胱氨酸的C（10）双取代的CC4变体的途径。基于（i）半胱氨酸（或N-取代的衍生物）的C–H活化，随后的N-烷基化（以使二聚体形成）和（ii）CC4的直接C–H活化和硼化，已评估了两种方法。两种方法都提供了对C（10）-官能化CC4衍生物的访问，但是CC4的直接硼酸酯化允许更广泛的官能团互变。
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