Tetrahedron p. 7859 - 7868 (1989)
Update date:2022-08-03
Topics:
Malan, Johannes C. S.
Steenkamp, Jacobus A.
Young, Desmond A.
Ferreira, Daneel
Acid-catalyzed condensation of (+)-mollisacacidin<(2R,3S,4R)-2,3-trans-3,4-trans-flavan-3,3',4,4',7-pentaol> with an excess of (-)-robinetinidol<(2R,3S)-2,3-trans-flavan-3,3',4,4',5',7-pentaol> afforded a novel series of bi-, tri-, and tetraflavanoid profisetinidins.They are accompanied by (-)-fisetinidol-(4α,2')-(-)-robinetinidol which results from the pyrogallol B-ring of (-)-robinetinidol serving as nucleophile competing with its resorcinol A-ring in coupling with a C-4 carbocationic intermediate.Similar condensation with (+)-epifisetinidol<(2S,3S)-2,3-cis-flavan-3,3',4',7-tetraol> led to the exclusive formation of <4,6>-interflavanyl bonds, these units being 'linearly' arranged in the tetraflavanoid analogue in contrast to the 'branched' nature of the (-)-robinetinidol homologue.
View MoreShaanxi Lighte Optoelectronics Material Co., Ltd.
Contact:+86-29-88320728-622/619/620
Address:No.55 INDUSTRY ROAD 2,XI'AN NATIONAL CIVIL AEROSPACE INDUSTRIAL PARK.XI'AN China 710065.
Nanjing Qirui Material Co., Ltd.
Contact:+86-25-52320053
Address:F4-5, #17 Building, Chuang Yi Yuan, No.6 Guanghua East Street, Nanjing, 210007 P.R.China
MS( MAOSHENG )Chemical CO.,LTD
Contact:+86-519-82726678.82726378
Address:TAOXI INDUSTRY ZONE JINTAN
Anyang Double Circle Auxiliary CO.,LTD
Contact:0086-134 6082 4403
Address:dongfeng road, anyang city, henan province,china
Shanghai PuYi Chem-Tech Co.,Ltd.
Contact:+86-21-57687505-227
Address:3 Floor, Building 11, No 201 MinYi Road, Songjiang District, Shanghai 201612, China
Doi:10.1039/DT9950000049
(1995)Doi:10.1007/BF00717352
(1994)Doi:10.1007/s10600-014-0929-5
()Doi:10.1021/ic500471w
(2014)Doi:10.1107/S0108270194006943
(1995)Doi:10.1002/chem.201603464
(2016)