Synthetic approaches to N- and 4-substituted 1,4-dihydro-3(2H)-isoquinolinone derivatives
作者:Michael J. O’ Sullivan、Richard J.D. Hatley、Christopher R. Wellaway、Sean P. Bew、Christopher J. Richards
DOI:10.1016/j.tet.2021.132455
日期:2021.11
reductive amination/cyclisation process resulted in N-substituted 1,4-dihydro-3(2H)-isoquinolinones. With H2NCH2R sodium borohyride is a suitable reductant (11 examples), but H2NCHR1R2 required a transfer hydrogenation using ammonium formate catalysed by palladium on carbon (9 examples). 4-Substituted-1,4-dihydro-3(2H)-isoquinolinones were synthesised by deprotonation (n-butyllithium) and addition of R3CH2Br
在还原胺化/环化过程中,2-(2-甲酰基苯基)乙酸甲酯与伯胺的反应产生N-取代的 1,4-二氢-3(2H)-异喹啉酮。H 2 NCH 2 R 硼氢化钠是合适的还原剂(11 个实施例),但 H 2 NCHR 1 R 2需要使用由披钯碳催化的甲酸铵进行转移氢化(9 个实施例)。通过去质子化(正丁基锂)和添加 R 3 CH 2 Br(12 个实例,其中 R 3 = 烷基、Ar、CH CH 2、C )合成了 4-取代的-1,4-二氢-3(2H)-异喹啉酮CH)。使用衍生自 H 2 NCHMeR 2 [R 2 = (η 5 -C 5 H 4 )Co(η 4 -C 4 Ph 4 ) - max. 的1,4-二氢-3(2H)-异喹啉酮获得适度的非对映选择性。dr = 1.9 : 1],但使用 H 2 NCHMeFc(Fc = 二茂铁)提供了一种用甲酸进行 1,4-二氢-3(2H)-异喹啉酮N-脱保护的新方法。
Synthetic approaches to 2-substituted 1-oxo- and 3-oxotetrahydroisoquinolines
作者:Chen-Yu Cheng、Hui-Bing Tsai、Mei-Shan Lin
DOI:10.1002/jhet.5570320113
日期:1995.1
2-Substituted homophthalimides 2a-c were reduced regioselectively with sodium borobydride to carbinol-lactam intermediates 3a-c, which were dehydrated, followed by hydrogenation, to give 1-oxo-tetrabydroisoquinolines or 3,4-dihydroisoquinolin-1(2H)ones 5a-c. The isomeric 3-oxo-tetrahydro-isoquinolines or 1,4-dihydroisoquinolin-3(2H)-ones 8a-i were obtained in satisfactory yields via heating 3-isochromanone
A new and facile approach to 1,2-dihydroisoquinolin-3(4<i>H</i>)-imines by the Cu(<scp>i</scp>)-catalyzed reaction of 2-ethynylbenzyl methanesulfonates, sulfonyl azides and amines
作者:Ying Huang、Weiyin Yi、Qihui Sun、Lirong Zhang、Fengping Yi
DOI:10.1039/c7ra12412k
日期:——
A new, step-economical and operationally simple access to unsubstituted 1,2-dihydroisoquinolin-3(4H)-imines by Cu-catalyzed MCRs under mild conditions is described. In addition, selective hydrolysis of imines to the corresponding 1,2-dihydroisoquinolin-3(4H)-ones under refluxed conc. HCl has also been investigated.