Enantioselective synthesis of 3-hydroxy oxindoles by ytterbium-catalysed decarboxylative addition of β-ketoacids to isatins.
نویسندگان
چکیده
A ytterbium(III)-indapybox catalysed enantioselective decarboxylative addition reaction of β-ketoacids to isatins is described. The biologically important 3-hydroxy oxindoles were obtained in high yields and excellent enantioselectivities.
منابع مشابه
Catalytic Enantioselective Addition of Me2Zn to Isatins
Chiral α-hydroxyamide L5 derived from (S)-(+)-mandelic acid catalyzes the enantioselective addition of dimethylzinc to isatins affording the corresponding chiral 3-hydroxy-3-methyl-2-oxindoles with good yields and er up to 90:10. Furthermore, several chemical transformations were performed with the 3-hydroxy-2-oxindoles obtained.
متن کاملFacile creation of 3-substituted-3-hydroxy-2-oxindoles by arginine-catalyzed aldol reactions of α,β-unsaturated ketones with isatins.
An efficient approach for the synthesis of 3-substituted-3-hydroxy-2-oxindoles has been achieved via an aldol reaction of α,β-unsaturated ketones and isatins using arginine as an organocatalyst. A range of 3-substituted-3-hydroxy-2-oxindoles were obtained in moderate to high (up to 99%) yields. These 3-substituted-3-hydroxy-2-oxindoles with an additional enone moiety provide an opportunity for ...
متن کاملStereoselective Synthesis of Fused Aziridines via One-Pot Sequential Decarboxylative Mannich Reaction and Oxidative C-H Amination of Cyclic Imines with β-Ketoacids.
A novel one-pot sequential transformation via decarboxylative Mannich reaction (DMR) and oxidative C-H amination of cyclic imines with β-ketoacids is described. This methodology has been utilized to provide access to fused aziridines with excellent diastereoselectivity. Several examples of catalytic enantioselective sequential transformation are presented.
متن کاملOrganocatalytic asymmetric decarboxylative cyanomethylation of isatins using L-proline derived bifunctional thiourea.
First asymmetric decarboxylative cyanomethylation of isatins is reported herewith using bifunctional thiourea derived from l-proline in good yields and enantioselectivities. This strategy enables the construction of various 3-cyanomethylene substituted 3-hydroxyoxindoles in enantioselective manner. Enantioselective synthesis of CPC-1 alkaloid has been accomplished in fewer steps.
متن کاملBiomimetic catalytic enantioselective decarboxylative aldol reaction of β-ketoacids with trifluoromethyl ketones.
We disclose an organocatalyzed enantioselective decarboxylative ketone aldol reaction of β-ketoacids with trifluoromethyl ketones in the presence of biscinchona alkaloid (DHQD)(2)AQN, affording chiral tertiary alcohols in up to 98% yield and 90% ee.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Organic & biomolecular chemistry
دوره 11 38 شماره
صفحات -
تاریخ انتشار 2013