Facile Synthesis of 3-Substituted Thiazolo[2,3-α]tetrahydroisoquinolines
作者:Sheng-Han Huang、Wan-Yu Huang、Guo-Lun Zhang、Te-Fang Yang
DOI:10.3390/molecules26206126
日期:——
It was found that 4-hydroxy-2-butenoic ester (11) could not react with 3,4-dihydro-isoquinoline (4a). Individual addition reactions of γ-mercapto-α,β-unsaturated esters (18) and -unsaturated amide (19) with 3,4-dihydroisoquinolines (4) were carried out under appropriate conditions to provide the corresponding thiazolo[2,3-α]isoquinoline derivatives with good yields (up to 87%) and significant diastereomeric
Tandem additions of 3,4-dihydroisoquinolines to γ-hydroxy-α,β-unsaturated ketones: a green and new access to oxazolo[2,3-a]tetrahydroisoquinolines
作者:Sheng-Han Huang、Yu-Wei Shih、Wen-Tse Huang、Deng-Hong Li、Te-Fang Yang
DOI:10.1039/c6ra20708a
日期:——
Addition reaction of 3,4-dihydroisoquinolines with γ-hydroxy-α,β-unsaturated ketones furnished a variety of diastereomerically pure oxazolo[2,3-a]tetrahydro-isoquinolines, which could be purified by either recrystallization or solvent evaporation. The reaction proceeded smoothly under “green” conditions without an additive and catalyst, giving the target molecules in good to excellent yields.
3,4-二氢异喹啉与γ-羟基-α,β-不饱和酮的加成反应提供了多种非对映体纯的恶唑并[2,3 - a ]四氢异喹啉,可以通过重结晶或溶剂蒸发法将其纯化。在没有添加剂和催化剂的“绿色”条件下,反应可顺利进行,从而使目标分子的收率良好至极佳。
Decahydro-8H-isoquino[2,1-g][1,6]naphthyridine and decahydrobenzo[a]pyrrolo[2,3-e]quinolizine derivatives
申请人:SYNTEX (U.S.A.) INC.
公开号:EP0524004A1
公开(公告)日:1993-01-20
Compounds of the formula
wherein:
X and Y are independently hydrogen; hydroxy; lower alkyl of 1-6 carbon atoms; lower alkoxy of 1-6 carbon atoms; or halo; or X and Y when adjacent and taken together are methylenedioxy or ethylene-1,2-dioxy;
R is lower alkyl of 1-6 carbon atoms; cycloalkyl of 3-8 carbon atoms; phenyl or phenyl lower alkyl in which any phenyl group may be optionally substituted by one or two substituents chosen from the group consisting of halo, lower alkyl of 1-4 carbon atoms and lower alkoxy of 1-4 carbon atoms; or -ANHSO₂R¹; wherein A is lower alkylene of 1-6 carbon atoms; and R¹ is lower alkyl of 1-6 carbon atoms or -NR²R³; wherein
R² and R³ are independently hydrogen or lower alkyl of 1-6 carbon atoms, or R² and R³ taken together are cycloalkyl of 3-8 carbon atoms; and
n is 1 or 2;
and the pharmaceutically acceptable salts thereof, are useful as α₂-adrenoceptor antagonists, in particular as peripherally selective α₂ -adrenoceptor antagonists.
catalytic enantioselective construction of chiral THIQUINOL and its derivatives has been accomplished through a chiral phosphoric-acid-catalyzed direct aza-Friedel–Crafts reaction of 3,4-dihydroisoquinolines with 2-naphthols/anthracen-2-ols/phenanthren-9-ol. This method offers a powerful and straightforward synthetic route toward chiral THIQUINOL derivatives with good to excellent yields and enantioselectivities