Magnesium chloride (MgCl2) catalyzed highly regioselective C-3 ring opening of 2,3 epoxy alcohols by N-nucleophile
作者:Amit Kumar、Gautam Panda
DOI:10.1016/j.tetlet.2021.153013
日期:2021.4
herein report Magnesiumchloride (MgCl2) catalyzed first highly C3-selective ring-opening reaction of various 2,3-epoxy alcohols with assorted N-Nucleophiles and sodium azide to furnish 3-amino-1,2 diols and 3-azido-1,2 diols respectively in high yields under mild reactionconditions. This protocol attributes the use of catalytic amount of Magnesiumchloride (MgCl2), simple reactionconditions, practical
Co(iii)(salen)-catalyzed HKR of two stereocentered alkoxy- and azido epoxides: a concise enantioselective synthesis of (S,S)-reboxetine and (+)-epi-cytoxazone
作者:R. Santhosh Reddy、Pandurang V. Chouthaiwale、Gurunath Suryavanshi、Vilas B. Chavan、Arumugam Sudalai
DOI:10.1039/c0cc00650e
日期:——
The HKR of racemic syn- or anti- alkoxy- and azido epoxides catalyzed by Co(salen) complex affords a practical access to a series of enantioenriched syn- or anti- alkoxy- and azido epoxides and the corresponding 1,2-diols. This strategy has been successfully employed in the concise, enantioselective synthesis of bioactive molecules such as (S,S)-reboxetine and (+)-epi-cytoxazone.
Stereoselective total synthesis of mugineic acid (1), a unique phytosiderophore from roots of barley, has been achieved from madily available (2S,3S)- and (2R,3R)-2,3-epoxycinnamyl alcohols (5) and (6). The key step is the oxidation of the phenyl group to the carboxylic acid by use of the ruthenium trichloride-sodium metaperiodate system.
Efficient synthesis of mugineic acid, a typical phytosiderophore, utilizing the phenyl group as the carboxyl synthon
Stereoselective total synthesis of mugineic acid, a unique phytosiderophore from roots of barley, has been achieved from (2R,3R)- and (2S,3S)-2,3-epoxycinnamyl alcohols employing the phenyl group as the carboxyl synthon.
Total Syntheses of Phytosiderophores, 3-Epi-Hydroxymugineic Acid, Distichonic Acid A, and 2′-Hydroxynicotianamine
First total syntheses of the unique phytosiderophores, 3-epi-hydroxymugineic acid (2), distichonic acid A (3), and 2'-hydroxynicotianamine (5), have been efficiently achieved from the same intermediates used for the synthesis of mugineic acid (1), the typical phytosiderophore.