Enantioselective synthesis of (+)-O-trimethylsappanone B and (+)-O-trimethylbrazilin
摘要:
The homoisoflavanoid (+)-O-trimethylbrazilin (1b) was prepared in 70% yield and 92% ee by acid-catalyzed rearrangement of O-trimethylsappanol (8) prepared by reduction of (R)-(-)-O-trimethylsappanone B (2b). The key step in the synthesis of (R)-(-)-2b is the reagent-controlled highly enantioselective hydroxylation (94%) of the sodium enolate of (+/-)-4-chromanone (3b) with the (+)-8,8-dichlorocamphorsulfonyl oxaziridine 7b.
Enantioselective synthesis of (+)-O-trimethylsappanone B and (+)-O-trimethylbrazilin
摘要:
The homoisoflavanoid (+)-O-trimethylbrazilin (1b) was prepared in 70% yield and 92% ee by acid-catalyzed rearrangement of O-trimethylsappanol (8) prepared by reduction of (R)-(-)-O-trimethylsappanone B (2b). The key step in the synthesis of (R)-(-)-2b is the reagent-controlled highly enantioselective hydroxylation (94%) of the sodium enolate of (+/-)-4-chromanone (3b) with the (+)-8,8-dichlorocamphorsulfonyl oxaziridine 7b.
Synthesis of 3-(2-Olefinbenzyl)-4<i>H</i>-chromen-4-one through Cyclobenzylation and Catalytic C–H Bond Functionalization Using Palladium(II)
作者:Yu-Feng Lin、Chi Fong、Wan-Ling Peng、Kuei-Chien Tang、Yi-En Liang、Wen-Tai Li
DOI:10.1021/acs.joc.7b01626
日期:2017.10.20
and benzyl bromide to produce homoisoflavonoid. The second step involves intermolecular Pd-catalyzed π-chelating-assisted C–H bond olefination. Using the C-2/C-3 double bond of chromone, palladium-catalyzed aryl C–H bond activation can be functionalized to generate ortho-olefination derivatives in moderate to high yields.
开发了一种有效的策略,可以分两步合成3-(2-烯烃苄基)-4 H -chromen -4-one。第一步是(E)-3-(二甲基氨基)-1-(2-羟基苯基)丙-2-烯-1-酮与苄基溴之间的环苄基化反应,以生成均异黄酮。第二步涉及分子间Pd催化的π螯合辅助的C–H键烯化。使用色酮的C-2 / C-3双键,可以将钯催化的芳基C–H键活化功能化,以中等至高收率生成邻烯化衍生物。
Jain, A. C.; Sharma, Anita; Srivastava, Rene, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1983, vol. 22, # 11, p. 1119 - 1121
作者:Jain, A. C.、Sharma, Anita、Srivastava, Rene
DOI:——
日期:——
JAIN, A. C.;SHARMA, ANITA;SRIVASTAVA, RENE, INDIAN J. CHEM., 1983, 22, N 11, 1119-1121
作者:JAIN, A. C.、SHARMA, ANITA、SRIVASTAVA, RENE
DOI:——
日期:——
Enantioselective synthesis of (+)-O-trimethylsappanone B and (+)-O-trimethylbrazilin
作者:Franklin A. Davis、Bang Chi Chen
DOI:10.1021/jo00059a026
日期:1993.3
The homoisoflavanoid (+)-O-trimethylbrazilin (1b) was prepared in 70% yield and 92% ee by acid-catalyzed rearrangement of O-trimethylsappanol (8) prepared by reduction of (R)-(-)-O-trimethylsappanone B (2b). The key step in the synthesis of (R)-(-)-2b is the reagent-controlled highly enantioselective hydroxylation (94%) of the sodium enolate of (+/-)-4-chromanone (3b) with the (+)-8,8-dichlorocamphorsulfonyl oxaziridine 7b.