作者:Mukesh Kumar、Pankaj Chauhan、Stephen J. Bailey、Ehsan Jafari、Carolina von Essen、Kari Rissanen、Dieter Enders
DOI:10.1021/acs.orglett.8b00175
日期:2018.2.16
An efficient and highly stereoselective one-pot, four-component synthesis of functionalized tricyclic chromanes has been achieved through an organocatalyzed quadruple dominoreaction. The reaction sequence involves an oxa-Michael/Michael/Michael/aldol condensation between alcohols, 2 equiv of acrolein, and nitrochromenes to generate the pharmaceutically important tricyclic chromanes bearing three contiguous
通过有机催化的四重多米诺反应,已实现了高效且高度立体选择性的一锅四组分官能化三环苯并吡喃的合成。反应顺序包括在醇,2当量的丙烯醛和硝基色酮之间进行oxa-Michael / Michael / Michael / aldol缩合反应,以产生药学上重要的三环苯并三环苯并烷,其中包括三个连续的立体异构中心,包括手性四取代碳中心,具有良好的多米诺产量(30– 70%)和出色的非对映选择性和对映选择性(> 20:1 dr和> 99%ee)。
Enantioselective cascade double Michael addition of 3-nitro-2H-chromenes and acyclic enones: efficient synthesis of functionalized tricyclic chroman derivatives
作者:Jun-Hua Li、Da-Ming Du
DOI:10.1039/c5ob01211b
日期:——
tetrahydro-6H-benzo[c]chromenes and their derivatives has been developed. The corresponding products were obtained by the cascade double Michael addition of 3-nitro-2H-chromenes and their derivatives with α,β-unsaturated ketones catalyzed by a combination of a quinine-derivedprimaryamine and benzoic acid. Through this methodology, the desired products could be obtained in moderate to good yields (up to
已经开发出用于不对称构造对映体富集的四氢-6 H-苯并[ c ]色烯及其衍生物的有效方案。相应的产物通过将3-硝基-2 H-色酮及其衍生物与奎宁衍生的伯胺和苯甲酸的组合催化的α,β-不饱和酮进行级联双迈克尔加成而获得。通过这种方法,可以以中等至良好的收率(高达90%),具有优异的非对映选择性(高达> 25:1 dr)和中等至优异的对映选择性(高达95%ee)获得所需的产物。
Organocatalytic [3 + 2] cycloaddition of oxindole-based azomethine ylides with 3-nitrochromenes: a facile approach to enantioenriched polycyclic spirooxindole-chromane adducts
作者:Shiqi Wu、Guodong Zhu、Shiqiang Wei、Hongbo Chen、Jingping Qu、Baomin Wang
DOI:10.1039/c7ob03051g
日期:——
An organocatalytic asymmetric [3 + 2] cycloaddition of oxindole-based azomethine ylides with 3-nitro-2H-chromenes has been developed. This reaction provides a facile approach to densely functionalized polycyclic spirooxindole-chromane adducts featuring four contiguous stereogenic centers, including two tetrasubstituted carbon centers. The products were obtained in high yields with good to excellent
Asymmetric Friedel–Crafts alkylation of indoles with 3-nitro-2H-chromenes catalyzed by diphenylamine-linked bis(oxazoline) and bis(thiazoline) Zn(II) complexes
作者:Yang Jia、Wen Yang、Da-Ming Du
DOI:10.1039/c2ob25360g
日期:——
enantioselective Friedel–Crafts alkylation of indoles with 3-nitro-2H-chromenes catalyzed by diphenylamine-linked bis(oxazoline) and bis(thiazoline) Zn(II) complexes has been developed. This asymmetric Friedel–Crafts alkylation led to medicinally privileged indolyl(nitro)chromans in good yields with high enantioselectivities (up to 95% ee) and diastereoselectivities under mild reaction conditions.
Organocatalytic asymmetric conjugate addition of malonates to 3-nitro-2H-chromenes
作者:Shao-zhen Nie、Zhi-peng Hu、Yi-ning Xuan、Jin-jia Wang、Xue-ming Li、Ming Yan
DOI:10.1016/j.tetasy.2010.07.015
日期:2010.8
The conjugateaddition of malonates to 3-nitro-2H-chromenes has been studied in the presence of a number of chiral organocatalysts. A bifunctional thiourea-tertiary amine was found to be an efficient catalyst for the reaction. Good yields and enantioselectivities were obtained for a variety of substituted 3-nitro-2H-chromenes. Diethyl malonate and diisopropyl malonate were applicable for the reaction