Bioxindole-取代六氢的不对称合成[2,3- b ]呋喃经由Acylidenoxindoles /靛红,Acylidenoxindoles和联烯酸酯的氢化奎宁蒽醌-1,4-二基二醚催化的Domino环
摘要:
AbstractHydroquinine anthraquinone‐1,4‐diyl diether [(DHQ)2AQN]‐catalyzed unprecedented asymmetric domino annulation reactions of acylidenoxindoles/isatins, acylidenoxindoles and allenoates are disclosed in this communication, providing a facile access to hexahydrofuro[2,3‐b]furans containing four contiguous chiral centers in good to excellent yields along with good to excellent ee values and moderate to good dr values. Based on theoretical investigations, a concerted [3+2] ring‐closure process was proposed, in which steric hindrance and π–π stacking interaction between catalyst and substrate subtly co‐control the diastereoselectivity of the reaction.magnified image
The reaction of pyruvates (3) with but-2-enyl-9-borabicyclo[3.3.1]nonane(2a) or its α-silyl and α-stannyl substituted derivatives (10) produced the threo-isomer [(4) or (11), respectively] stereoselectively; the latter reaction was applied to the synthesis of cis-crobarbatic acid(14).
TREATMENT OF MITOCHONDRIA-RELATED DISEASES AND IMPROVEMENT OF AGE-RELATED METABOLIC DEFICITS
申请人:Cooper Garth James Smith
公开号:US20100160428A1
公开(公告)日:2010-06-24
Treatment of mitochondrial related conditions in mammals with antagonists or chelating agents of copper (II), preferably tetramines or penicillamines. These agents affect TGF-beta, Smad 4, collagen IV, cytochrome C oxidase and erectile dysfunction.