Synthesis and Cytotoxicity of Racemic Isodeoxypodophyllotoxin Analogues with Isoprene-Derived Side Chains
作者:Yu Zhao、Ju Hong Feng、Hong Xia Ding、Yi Xiong、Christopher H. K. Cheng、Xiao Jiang Hao、Yong Min Zhang、Yuan Jiang Pan、Françoise Guéritte、Xiu Mei Wu、Hua Bai、Joachim Stöckigt
DOI:10.1021/np050547x
日期:2006.8.1
isoprene-derived side chains at the E-ring were designed and synthesized. For comparison, compound 39, with a benzyloxy group on the E-ring, and six D-ring opened analogues, 40-45, were also prepared. All the synthetic compounds were evaluated for their cytotoxic activities in vitro against seven cultured human tumor cell lines. Compounds 27, 43, and 44 were more cytotoxic than etoposide on BEL-7404, A549, and
Efficient synthesis of lactonic and thionolactoniclignans and evaluation of their anti-oxidant, anti-inflammatory and cytotoxic activities
作者:Trimurtulu Golakoti、Hari Krishna Kancharla、Bharani Meka、Y. L. N. Murthy
DOI:10.1007/s00044-016-1709-5
日期:2016.12
treating these lignans with Lawesson’s reagent. For all the prepared compounds the antioxidant, anti-inflammatory (5-lipoxygenase inhibition) and cytotoxic (Brine shrimp lethality test) activities were tested. The compounds 5a, 5b, 5c, 5d, 5e and 5f showed good 5-lipoxygenase inhibition activity. The thiono lignan 6d showed impressive cytotoxic activity.
Efficient synthesis of natural (+)-collinusin using catalytic asymmetric hydrogenation with a chiral bisphosphine-rhodium(I) complex.
作者:Toshiaki MORIMOTO、Mitsuo CHIBA、Kazuo ACHIWA
DOI:10.1248/cpb.37.3161
日期:——
(+)-Collinusin, a natural lignan lactone, has been synthesized by using the asymmetric hydrogenation of a α-veratrylidenesuccinic acid half ester with a (S, S)-MOD-DIOP-rhodium(I) complex catalyst as a key reaction, and the absolute configuration of the C-3 has been determined to be R__-.
Synthesis of aryltetralin and dibenzylbutyrolactone lignans: (±)-lintetralin, (±)-phyltetralin, and (±)-kusunokinin
作者:Pralhad A. Ganeshpure、Robert Stevenson
DOI:10.1039/p19810001681
日期:——
Application of a general synthetic pathway for aryltetralin and dibenzylbutyrolactonelignans, starting from the lithium enolate of 3-(3,4-dimethoxybenzyl)butyrolactone (1) led to syntheses of (±)-lintetralin (4), (±)-phyltetralin (5), (±)-isogalcatin (12), and (±)-kusunokinin (13).
A highly regio- and stereoselective Pd-catalyzed electrocarboxylation of Baylis-Hillman acetates: An interesting switchable regioselectivity based on electrode material
regio- and stereoselective palladium catalyzed electrocarboxylation of Baylis-Hillman acetates. We found an interesting unprecedented electrode material-controlled switchable regioselectivity. When Platinum was taken as cathode, benzylic carboxylation products were found to be the predominant regioisomers (condition A). Under similar reaction conditions when Nickel was taken as cathode, a complete reversal
我们开发了一种新型的区域选择性和立体选择性钯催化 Baylis-Hillman 醋酸盐的电羧化反应。我们发现了一种有趣的、前所未有的电极材料控制的可切换区域选择性。当铂作为阴极时,发现苄基羧化产物是主要的区域异构体(条件 A)。在以镍为阴极的类似反应条件下,观察到区域选择性完全逆转,提供肉桂基羧化产物作为主要的区域异构体,仅具有 (E)-立体化学(条件 B)。我们提出了合理的机制来解释区域选择性的转换,这得到了 TEMPO 实验的进一步支持。