BF3·Et2O and trifluoroacetic acid/triethyl amine-mediated synthesis of functionalized piperidines
作者:Amar R. Mohite、Prakash R. Sultane、Ramakrishna G. Bhat
DOI:10.1016/j.tetlet.2011.10.072
日期:2012.1
A two-step short and efficient strategy for the synthesis of substituted piperidones and piperidines in high diastereoselectivity (only trans-configuration), by employing cascade type reaction using BF3·Et2O or by carrying out one pot deprotection of tBoc group followed by intramolecular aza-Michael addition of α,β-unsaturated beta keto esters has been developed. Using a similar strategy a short access
通过使用BF 3 ·Et 2 O的级联反应或对t Boc基团进行一锅脱保护,以高效率的非对映选择性(仅反式构型)合成取代的哌啶酮和哌啶的两步快速有效策略通过分子内的氮杂-迈克尔加成,已经开发了α,β-不饱和β-酮酯。还描述了使用类似的策略短时间获得羟基哌酸的方法。该方法的主要特点是非常简单,快速的实验程序,涉及温和条件,并且仅进行一两次色谱纯化。