硝酸铈(IV)硝酸铵(CAN)催化的色胺,α,β-不饱和醛和β-二羰基化合物之间的顺序多组分反应可在单个合成操作中提供高度取代的吲哚[2,3- a ]喹啉。两个环通过创建两个C产生 C和两个C 通过包括初始β-烯胺酮形成多米诺过程N键,接着个体迈克尔加成,6-外型- trig的环化,亚胺的形成,和的Pictet-格勒步骤。此外,该反应是非对映选择性的,仅提供具有反式的化合物H-2和H-12b质子之间的关系 使用带有较少亲核侧链芳环的胺(5-溴色胺,3,4-二甲氧基苯基乙胺)会阻止Pictet-Spengler的最终步骤,并导致N-吲哚基乙基或N-苯基乙基-1,4-二氢吡啶被环化在甲醇/水中存在HCl时,生成相应的吲哚并[2,3- a ]喹啉或苯并[ a ]喹啉。用三乙酰氧基硼氢化钠处理稠合的喹啉嗪衍生物可得到相应的吲哚并[2,3- a ]喹唑烷或苯并[ a ]喹唑烷,它们具有四个立体异构中心,是两种非对映异构体的混合物。
The enantioselective three-component Michael addition-Pictet-Spengler sequence of beta-ketoesters 1, alpha,beta-unsaturated aldehydes 2 and tryptamines 4 represents a facile and rapid one-pot access to highly substituted indoloquinolizidines in moderate to excellent yields and good to excellent enantioselectivities.
A facile and green method catalyzed by α-amylase has been developed for the synthesis of highly substituted indoloquinolizines using tryptamines, β-ketoesters and α,β-unsaturated aldehydes. The reaction afforded a variety of products in moderate to good yields and with high diastereoselectivity. The densely functionalized products were obtained in a single synthetic operation under mild conditions
A β-Enaminone-Initiated Multicomponent Domino Reaction for the Synthesis of Indoloquinolizines and Benzoquinolizines from Acyclic Precursors
作者:Padmakar A. Suryavanshi、Vellaisamy Sridharan、J. Carlos Menéndez
DOI:10.1002/chem.201204594
日期:2013.9.23
N‐phenylethyl‐1,4‐dihydropyridines, which are cyclized to the corresponding indolo[2,3‐a]quinolizines or benzo[a]quinolizines in the presence of HCl in methanol/water. Treatment of the fused quinolizine derivatives with sodium triacetoxyborohydride led to the corresponding indolo[2,3‐a]quinolizidines or benzo[a]quinolizidines, possessing four stereogenic centers, as mixtures of two diastereomers.
硝酸铈(IV)硝酸铵(CAN)催化的色胺,α,β-不饱和醛和β-二羰基化合物之间的顺序多组分反应可在单个合成操作中提供高度取代的吲哚[2,3- a ]喹啉。两个环通过创建两个C产生 C和两个C 通过包括初始β-烯胺酮形成多米诺过程N键,接着个体迈克尔加成,6-外型- trig的环化,亚胺的形成,和的Pictet-格勒步骤。此外,该反应是非对映选择性的,仅提供具有反式的化合物H-2和H-12b质子之间的关系 使用带有较少亲核侧链芳环的胺(5-溴色胺,3,4-二甲氧基苯基乙胺)会阻止Pictet-Spengler的最终步骤,并导致N-吲哚基乙基或N-苯基乙基-1,4-二氢吡啶被环化在甲醇/水中存在HCl时,生成相应的吲哚并[2,3- a ]喹啉或苯并[ a ]喹啉。用三乙酰氧基硼氢化钠处理稠合的喹啉嗪衍生物可得到相应的吲哚并[2,3- a ]喹唑烷或苯并[ a ]喹唑烷,它们具有四个立体异构中心,是两种非对映异构体的混合物。