Synthesis of 2,3-Dialkyl-5-hydroxybenzofurans via a One-pot, Three-step Reaction Sequence of 2-Monosubstituted 1,3-Diketones and 1,4-Benzoquinones
作者:Qing Dong、Yu-Huan Yang、Xue-Jiao Lv、Jia-Hui Liu、Yan-Kai Liu
DOI:10.1021/acs.joc.4c00511
日期:2024.5.17
An economical one-pot, three-step reaction sequence of readily available 2-monosubstituted 1,3-diketones and 1,4-benzoquinones has been explored for the facile access of 2,3-dialkyl-5-hydroxybenzofurans. By using cheap K2CO3 and conc. HCl as the reaction promoters, the reaction occurs smoothly via sequential Michael addition, aromatization, retro-Claisen, deacylation, hemiketalization, and dehydration
为了方便地获得 2,3-二烷基-5-羟基苯并呋喃,我们探索了一种经济的一锅三步反应序列,由容易获得的 2-单取代 1,3-二酮和 1,4-苯醌组成。通过使用廉价的 K 2 CO 3和浓缩物。以HCl为反应促进剂,通过连续的迈克尔加成、芳构化、逆克莱森、脱酰化、半缩酮化和脱水等过程,反应在温和条件下顺利进行,实用性强。此外,在衍生化研究过程中观察到一个有趣的现象,其中二氢喹啉通过歧化过程分别转化为四氢喹啉和喹啉产物。
Adam, Waldemar; Albrecht, Olaf; Feineis, Erich, Liebigs Annalen der Chemie, 1991, p. 33 - 40
NANBU M.; YAMAGUCHI S.; SUGIMASA Y.; MIYAURA T.; KAWASE Y., BULL. CHEM. SOC. JAP. <BCSJ-A8>, 1975, 48, NO 11, 3423-3424
作者:NANBU M.、 YAMAGUCHI S.、 SUGIMASA Y.、 MIYAURA T.、 KAWASE Y.
DOI:——
日期:——
2-AMINOPYRIMIDIN-4-ONE AND 2-AMINOPYRIDINE DERIVATIVES BOTH HAVING BACE1-INHIBITING ACTIVITY
申请人:Yonezawa Shuji
公开号:US20110237576A1
公开(公告)日:2011-09-29
The present invention provides a compound which has an effect of inhibiting amyloid-β production and is useful as a therapeutic agent for diseases induced by production, secretion and/or deposition of amyloid-β proteins. The present invention relates to a compound represented by formula (I) or a pharmaceutically acceptable salt or solvate thereof:
wherein A is optionally substituted carbocyclic diyl or optionally substituted heterocyclic diyl; B is an optionally substituted carbocyclic group or an optionally substituted heterocyclic group; R
1
is a group such as optionally substituted lower alkyl; R
2
is a group such as hydrogen; and R
3a
and R
3b
are each independently a group such as hydrogen, provided that the following compound is excluded.